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Luke Wilson
11/29/2025
Earth and Space Science
The Six Kingdoms Of Life
39
•
Nov 29, 2025
•
Luke Wilson
@lukewilson_toho
Dive into the amazing world of living things! Scientists organize... Show more








Ever wondered how scientists organize all the different types of life on our planet? There are millions of different species, but they can be sorted into six major kingdoms based on how they're built, how they get food, and other characteristics.
Each kingdom represents a branch on the tree of life with its own special features. From tiny single-celled organisms to giant redwood trees, all living things fit somewhere in these six categories.
You'll soon discover that some kingdoms contain organisms that live in extreme places, while others include creatures you see every day. Learning about these kingdoms helps us understand how all life on Earth is connected!
Fun Fact: While we now recognize six kingdoms, scientists used to group all life into just two kingdoms: plants and animals!

Archaebacteria are the ultimate survivors of the living world! These tiny, single-celled organisms thrive in places where almost nothing else can live - like super hot springs, extremely salty lakes, and even acidic environments that would kill most other organisms.
These microscopic life forms are Earth's oldest inhabitants, dating back 3.5 billion years. That's almost as old as the planet itself! The name "archae" actually comes from Greek, meaning "ancient" or "old," which perfectly describes these primitive organisms.
Despite their simple structure, archaebacteria have incredible adaptations that let them survive in extreme conditions. Some can live in water near boiling temperatures, while others thrive in environments as acidic as battery acid!
Amazing Discovery: Some archaebacteria live in the digestive systems of cows and help them break down tough plant materials that would otherwise be indigestible!

Bacteria are everywhere - on your skin, in your food, and even inside your body! These single-celled organisms don't have a nucleus, which makes them different from most other cells you'll study.
Don't worry though - most bacteria are actually harmless or even helpful! The bacteria living in your stomach right now are essential for breaking down your food and keeping you healthy. Without these tiny helpers, you wouldn't be able to digest properly.
Bacteria reproduce incredibly fast by simply dividing in two. Just one bacterium dividing every 20 minutes could theoretically produce 5 quintillion bacteria (that's 5 followed by 18 zeros!) in a single day. No wonder infections can spread so quickly!
Did You Know? There are more bacteria in your body than human cells! Don't panic though - they're mostly working to keep you healthy.

The animal kingdom includes creatures of all shapes and sizes - from tiny insects to massive blue whales! Animals are multicellular organisms that need to eat food to survive, which makes them heterotrophs .
One key feature of most animals is their ability to move around. While plants stay rooted in one spot, animals can usually swim, crawl, walk, or fly to find food and escape danger. Some exceptions exist though - coral animals build colonies that stay fixed in place!
Scientists have identified about 1.5 million different animal species so far, but they believe millions more are still waiting to be discovered. Most animals reproduce sexually, with sperm fertilizing eggs to create offspring with genetic material from both parents.
Cool Connection: You're part of the animal kingdom too! Humans belong to the mammal group within the animal kingdom.

Plants are the green machines that power life on Earth! These multicellular organisms can make their own food using sunlight, water, and carbon dioxide through a process called photosynthesis. This ability makes them autotrophs .
Unlike animal cells, plant cells have stiff cell walls made of cellulose. These walls give plants both strength and flexibility, allowing them to stand tall while still being able to bend in the wind. The cell walls also help plants maintain their shape.
Some plants reach incredible sizes and ages! California redwood trees are the largest living organisms on Earth, towering over 350 feet tall. Even more impressive is a bristlecone pine tree that's been alive for 4,600 years - it was already ancient when the pyramids were built!
Think About It: Without plants producing oxygen through photosynthesis, most other life on Earth couldn't exist. Plants literally help us breathe!

Mushrooms, molds, and yeasts might look like plants, but they belong to their own kingdom - Fungi! These fascinating organisms were once classified as plants, but scientists discovered they're actually quite different.
While plant cell walls contain cellulose, fungi cell walls are made of chitin (the same material in insect exoskeletons). Another big difference is how they get food - fungi can't make their own food through photosynthesis like plants do. Instead, they absorb nutrients from their surroundings, often helping decompose dead organisms.
Scientists estimate there may be as many as 5.1 million different types of fungi, but we've only identified a small fraction so far! Fungi play crucial roles in our world - from decomposing dead material to helping make bread rise and creating medicines like penicillin.
Fascinating Fact: The largest living organism on Earth might actually be a honey fungus in Oregon that spreads underground across 2.4 miles (3.8 km)!

The Protista kingdom is like nature's "miscellaneous" file - it contains single-celled organisms that don't fit neatly into any other kingdom! These microscopic creatures show incredible diversity in how they look and function.
Protists can be unicellular (one cell), multicellular (many cells), or colonial (groups of cells living together). They're divided into two main groups based on how they get food. Protozoa are mobile protists that move around searching for food, while algae use sunlight to make their own food like plants do.
Some famous protists include amoebas, which change shape as they move, and euglenas, which have both plant-like and animal-like characteristics. These fascinating organisms can be found almost everywhere there's water - from puddles to ponds to oceans!
Mind-Blowing Fact: Some protists, like slime molds, can join together to form a larger organism that moves and acts as a single unit when food is scarce!
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
You can download the app in the Google Play Store and in the Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
App Store
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Luke Wilson
@lukewilson_toho
Dive into the amazing world of living things! Scientists organize all life on Earth into six main kingdoms, each with their own unique characteristics. Let's explore what makes each kingdom special and discover some cool facts about the different types... Show more

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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Ever wondered how scientists organize all the different types of life on our planet? There are millions of different species, but they can be sorted into six major kingdoms based on how they're built, how they get food, and other characteristics.
Each kingdom represents a branch on the tree of life with its own special features. From tiny single-celled organisms to giant redwood trees, all living things fit somewhere in these six categories.
You'll soon discover that some kingdoms contain organisms that live in extreme places, while others include creatures you see every day. Learning about these kingdoms helps us understand how all life on Earth is connected!
Fun Fact: While we now recognize six kingdoms, scientists used to group all life into just two kingdoms: plants and animals!

Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Archaebacteria are the ultimate survivors of the living world! These tiny, single-celled organisms thrive in places where almost nothing else can live - like super hot springs, extremely salty lakes, and even acidic environments that would kill most other organisms.
These microscopic life forms are Earth's oldest inhabitants, dating back 3.5 billion years. That's almost as old as the planet itself! The name "archae" actually comes from Greek, meaning "ancient" or "old," which perfectly describes these primitive organisms.
Despite their simple structure, archaebacteria have incredible adaptations that let them survive in extreme conditions. Some can live in water near boiling temperatures, while others thrive in environments as acidic as battery acid!
Amazing Discovery: Some archaebacteria live in the digestive systems of cows and help them break down tough plant materials that would otherwise be indigestible!

Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Bacteria are everywhere - on your skin, in your food, and even inside your body! These single-celled organisms don't have a nucleus, which makes them different from most other cells you'll study.
Don't worry though - most bacteria are actually harmless or even helpful! The bacteria living in your stomach right now are essential for breaking down your food and keeping you healthy. Without these tiny helpers, you wouldn't be able to digest properly.
Bacteria reproduce incredibly fast by simply dividing in two. Just one bacterium dividing every 20 minutes could theoretically produce 5 quintillion bacteria (that's 5 followed by 18 zeros!) in a single day. No wonder infections can spread so quickly!
Did You Know? There are more bacteria in your body than human cells! Don't panic though - they're mostly working to keep you healthy.

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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
The animal kingdom includes creatures of all shapes and sizes - from tiny insects to massive blue whales! Animals are multicellular organisms that need to eat food to survive, which makes them heterotrophs .
One key feature of most animals is their ability to move around. While plants stay rooted in one spot, animals can usually swim, crawl, walk, or fly to find food and escape danger. Some exceptions exist though - coral animals build colonies that stay fixed in place!
Scientists have identified about 1.5 million different animal species so far, but they believe millions more are still waiting to be discovered. Most animals reproduce sexually, with sperm fertilizing eggs to create offspring with genetic material from both parents.
Cool Connection: You're part of the animal kingdom too! Humans belong to the mammal group within the animal kingdom.

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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Plants are the green machines that power life on Earth! These multicellular organisms can make their own food using sunlight, water, and carbon dioxide through a process called photosynthesis. This ability makes them autotrophs .
Unlike animal cells, plant cells have stiff cell walls made of cellulose. These walls give plants both strength and flexibility, allowing them to stand tall while still being able to bend in the wind. The cell walls also help plants maintain their shape.
Some plants reach incredible sizes and ages! California redwood trees are the largest living organisms on Earth, towering over 350 feet tall. Even more impressive is a bristlecone pine tree that's been alive for 4,600 years - it was already ancient when the pyramids were built!
Think About It: Without plants producing oxygen through photosynthesis, most other life on Earth couldn't exist. Plants literally help us breathe!

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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Mushrooms, molds, and yeasts might look like plants, but they belong to their own kingdom - Fungi! These fascinating organisms were once classified as plants, but scientists discovered they're actually quite different.
While plant cell walls contain cellulose, fungi cell walls are made of chitin (the same material in insect exoskeletons). Another big difference is how they get food - fungi can't make their own food through photosynthesis like plants do. Instead, they absorb nutrients from their surroundings, often helping decompose dead organisms.
Scientists estimate there may be as many as 5.1 million different types of fungi, but we've only identified a small fraction so far! Fungi play crucial roles in our world - from decomposing dead material to helping make bread rise and creating medicines like penicillin.
Fascinating Fact: The largest living organism on Earth might actually be a honey fungus in Oregon that spreads underground across 2.4 miles (3.8 km)!

Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
The Protista kingdom is like nature's "miscellaneous" file - it contains single-celled organisms that don't fit neatly into any other kingdom! These microscopic creatures show incredible diversity in how they look and function.
Protists can be unicellular (one cell), multicellular (many cells), or colonial (groups of cells living together). They're divided into two main groups based on how they get food. Protozoa are mobile protists that move around searching for food, while algae use sunlight to make their own food like plants do.
Some famous protists include amoebas, which change shape as they move, and euglenas, which have both plant-like and animal-like characteristics. These fascinating organisms can be found almost everywhere there's water - from puddles to ponds to oceans!
Mind-Blowing Fact: Some protists, like slime molds, can join together to form a larger organism that moves and acts as a single unit when food is scarce!
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
You can download the app in the Google Play Store and in the Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
App Store
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user