Subjects
Biology
Chemistry
AP Chemistry
English
AP English Literature
Earth and Space Science
Nov 26, 2025
59
5 pages
Ellah Marie Ardaniel @ellahmri
Biodiversity is basically all the different types of life you'll find on Earth - from tiny bacteria to... Show more
Biodiversity refers to the millions of different species of plants, animals, and microorganisms living on Earth today. It's not just about counting species though - it also includes the variety of genes within species and the different places they live, like deserts, forests, and coral reefs.
Scientists have discovered over 170 million species so far, but there are probably millions more we haven't found yet! Species diversity is essentially another way of saying biodiversity - it's about how many different types of living things you can find in one area.
Biodiversity matters because it provides ecosystem services like cleaning our water, forming soil, and keeping our climate stable. It also gives us biological resources including food, medicines, wood, and even decorative plants. Plus, it offers social benefits through recreation, tourism, and cultural values that enrich our lives.
Quick Fact Many life-saving medicines come from plants and animals - protecting biodiversity could lead to discovering the next major medical breakthrough!
Endemic species are the real VIPs of biodiversity - they're species that exist in only one specific place on Earth and nowhere else. Think of them as nature's unique locals that you can't find anywhere else in the world.
Understanding extinction is crucial for biology exams. Extinction happens when a species completely disappears forever, while threatened species are those with uncertain survival chances. Many of these threats are anthropogenic, meaning they're caused by human activities rather than natural processes.
Evolution explains how animals and plants developed from earlier forms through gradual changes over many generations. The geological timescale helps scientists track these changes over Earth's 3+ billion year history, while radiocarbon dating lets them figure out exactly how old fossils and other remains are.
Climate change, embryology, and fossil evidence all play important roles in understanding how life has changed over time. These concepts frequently appear in exams, so make sure you can explain each one clearly.
Species can disappear naturally through climate change, sea level changes, acid rain, and invasive species taking over their habitats. When new species invade an area, they go through three key stages that you should memorise for tests.
Migration is when a species first arrives in a new area. Ecesis describes how well the newcomer adapts to its new ecosystem. Finally, aggression involves the species successfully reproducing and establishing itself permanently in its new home.
Unfortunately, human interference is now the biggest threat to biodiversity. Population growth, habitat destruction, pollution, intensive agriculture, and overhunting are wiping out species faster than natural processes ever did.
Natural selection drives evolution by favouring individuals with beneficial genetic traits. When environmental conditions change, populations must adapt, migrate to more suitable areas, or face extinction - there's no middle ground.
Remember This Tectonic plates, earthquakes, volcanic eruptions, ice ages, and asteroid collisions have all shaped evolution throughout Earth's history!
Geographic isolation and reproductive isolation are the two main ways new species develop. When populations get separated and can no longer breed together, they gradually become so different that they turn into completely separate species.
Geological processes like moving tectonic plates dramatically affect where life exists on Earth. As continents drift apart or collide, species either adapt to new conditions, migrate to better areas, or develop into entirely new species through natural selection.
Major climate changes and catastrophic events create evolutionary pressure that leads to both new species formation and mass extinctions. Ice ages, asteroid impacts, and other dramatic environmental shifts force rapid evolutionary changes.
Understanding keystone species (like pollinators and top predators) and foundation species (like elephants and beavers) is essential because they have enormous impacts on entire ecosystems. Keystone species are crucial for ecosystem function, while foundation species actually create or improve habitats that benefit many other organisms.
Exam Tip Remember that natural selection acts on individuals, but evolution happens to entire populations over many generations!
Elephants and beavers are perfect examples of foundation species because they dramatically reshape their environments in ways that help countless other species survive and thrive.
These animals are like ecosystem engineers - they create and maintain habitats that wouldn't exist without them, supporting entire communities of other plants and animals.
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.
0
Smart Tools NEW
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
Ellah Marie Ardaniel
@ellahmri
Biodiversity is basically all the different types of life you'll find on Earth - from tiny bacteria to massive elephants, and everything in between. Understanding how species evolve, survive, and sometimes disappear is crucial for protecting our planet's incredible variety... Show more
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Biodiversity refers to the millions of different species of plants, animals, and microorganisms living on Earth today. It's not just about counting species though - it also includes the variety of genes within species and the different places they live, like deserts, forests, and coral reefs.
Scientists have discovered over 170 million species so far, but there are probably millions more we haven't found yet! Species diversity is essentially another way of saying biodiversity - it's about how many different types of living things you can find in one area.
Biodiversity matters because it provides ecosystem services like cleaning our water, forming soil, and keeping our climate stable. It also gives us biological resources including food, medicines, wood, and even decorative plants. Plus, it offers social benefits through recreation, tourism, and cultural values that enrich our lives.
Quick Fact: Many life-saving medicines come from plants and animals - protecting biodiversity could lead to discovering the next major medical breakthrough!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Endemic species are the real VIPs of biodiversity - they're species that exist in only one specific place on Earth and nowhere else. Think of them as nature's unique locals that you can't find anywhere else in the world.
Understanding extinction is crucial for biology exams. Extinction happens when a species completely disappears forever, while threatened species are those with uncertain survival chances. Many of these threats are anthropogenic, meaning they're caused by human activities rather than natural processes.
Evolution explains how animals and plants developed from earlier forms through gradual changes over many generations. The geological timescale helps scientists track these changes over Earth's 3+ billion year history, while radiocarbon dating lets them figure out exactly how old fossils and other remains are.
Climate change, embryology, and fossil evidence all play important roles in understanding how life has changed over time. These concepts frequently appear in exams, so make sure you can explain each one clearly.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Species can disappear naturally through climate change, sea level changes, acid rain, and invasive species taking over their habitats. When new species invade an area, they go through three key stages that you should memorise for tests.
Migration is when a species first arrives in a new area. Ecesis describes how well the newcomer adapts to its new ecosystem. Finally, aggression involves the species successfully reproducing and establishing itself permanently in its new home.
Unfortunately, human interference is now the biggest threat to biodiversity. Population growth, habitat destruction, pollution, intensive agriculture, and overhunting are wiping out species faster than natural processes ever did.
Natural selection drives evolution by favouring individuals with beneficial genetic traits. When environmental conditions change, populations must adapt, migrate to more suitable areas, or face extinction - there's no middle ground.
Remember This: Tectonic plates, earthquakes, volcanic eruptions, ice ages, and asteroid collisions have all shaped evolution throughout Earth's history!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Geographic isolation and reproductive isolation are the two main ways new species develop. When populations get separated and can no longer breed together, they gradually become so different that they turn into completely separate species.
Geological processes like moving tectonic plates dramatically affect where life exists on Earth. As continents drift apart or collide, species either adapt to new conditions, migrate to better areas, or develop into entirely new species through natural selection.
Major climate changes and catastrophic events create evolutionary pressure that leads to both new species formation and mass extinctions. Ice ages, asteroid impacts, and other dramatic environmental shifts force rapid evolutionary changes.
Understanding keystone species (like pollinators and top predators) and foundation species (like elephants and beavers) is essential because they have enormous impacts on entire ecosystems. Keystone species are crucial for ecosystem function, while foundation species actually create or improve habitats that benefit many other organisms.
Exam Tip: Remember that natural selection acts on individuals, but evolution happens to entire populations over many generations!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Elephants and beavers are perfect examples of foundation species because they dramatically reshape their environments in ways that help countless other species survive and thrive.
These animals are like ecosystem engineers - they create and maintain habitats that wouldn't exist without them, supporting entire communities of other plants and animals.
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.
0
Smart Tools NEW
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
