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Updated Mar 14, 2026
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Genetika človeka je úžasná oblasť biológie, ktorá ti vysvetlí, prečo... Show more











Keď sa pozrieš do zrkadla, vidíš výsledok milionov rokov evolúcie a jedinečnú kombináciu génov od tvojich rodičov. Genetika človeka aplikuje základné princípy dedičnosti špecificky na náš druh.
Najdôležitejšie pojmy, ktoré musíš ovládať: Gén je základná jednotka dedičnosti - kúsok DNA, ktorý kóduje určitú bielkovinu. Alela je konkrétna forma génu - napríklad gén pre farbu očí môže mať alelu pre modré alebo hnedé oči.
Genotyp je tvoja kompletná genetická výbava, zatiaľ čo fenotyp je to, čo skutočne vidíš - farba očí, výška, krvná skupina. Dominantné alely sa prejavia aj v jednej kópii, recesívne potrebujú dve kópie na prejavenie.
💡 Tip na zapamätanie: Dominantná alela je ako hlasný spolužiak - stačí jedna a už ju počuješ. Recesívna je ako tichý spolužiak - potrebuješ dve, aby sa prejavila.
Homozygot má dve rovnaké alely (AA alebo aa), heterozygot má rôzne alely (Aa). Karyotyp je kompletná sada tvojich chromozómov - normálne 46,XX pre ženy alebo 46,XY pre mužov.

Predstav si, že jeden pokazený gén môže spôsobiť vážnu chorobu - presne o tom sú monogénne choroby. Sú tri hlavné typy dedičnosti, ktoré musíš rozlíšiť.
Autozómovo dominantná dedičnosť znamená, že choroba sa prejaví už pri jednej pokazenej kópii génu. Typický príklad je Huntingtonova choroba - neurodegeneratívne ochorenie, ktoré sa prejaví v dospelosti. Ak má jeden rodič túto chorobu, každé dieťa má 50% šancu na dedičnosť.
Autozómovo recesívna dedičnosť vyžaduje dve pokazené kópie génu. Cystická fibróza postihuje pľúca a tráviaci systém, ale prejaví sa len vtedy, ak dieťa zdedí defektnú alelu od oboch rodičov. Zdraví rodičia môžu byť prenášači a ani o tom nevedia.
💡 Zaujímavosť: Fenylketonúria (PKU) sa u nás testuje u všetkých novorodencov! Včasné odhalenie môže predísť poškodeniu mozgu.
X-viazaná recesívna dedičnosť postihuje hlavne mužov, lebo majú len jeden X chromozóm. Hemofília a farbosleposť sú klasické príklady - ženy sú často len prenášačky, muži sú postihnutí.

Nie všetky choroby spôsobuje jeden gén - väčšina je oveľa komplikovanejšia. Polygenné choroby vznikajú kombináciou viacerých génov plus vplyv prostredia.
Diabetes 2. typu, srdcové choroby alebo astma patria medzi tieto komplexné ochorenia. Nemajú jednoduchý dedičný vzor a nemôžeš ich predpovedať len z rodinnej anamnézy. Preto je takáto dôležitá prevencia - zdravý životný štýl môže "prepísať" genetickú predispozíciu.
Chromozómové aberácie sú úplne iná kategória. Trizómie znamenajú jeden chromozóm navyše - Downov syndróm (trizómia 21) je najznámejší príklad. Monozómie znamenajú chýbajúci chromozóm - Turnerov syndróm (45,X) postihuje ženy.
💡 Dôležité: Riziko chromozómových aberácií rastie s vekom matky, preto sa odporúča genetické poradenstvo po 35. roku života.
Klinefelterov syndróm (47,XXY) postihuje mužov a spôsobuje neplodnosť. Štrukturálne aberácie ako delécie alebo translokácie môžu byť balancované (jedinec je zdravý) alebo nebalancované (spôsobujú chorobu).

Genetické poradenstvo nie je len pre "problémové" rodiny - môže byť užitočné pre každého, kto plánuje deti. Je to komplexný proces, ktorý ti pomôže pochopiť tvoje genetické riziká.
Kedy ho potrebuješ? Ak sa v rodine vyskytla dedičná choroba, pri príbuzenskom manželstve, pokročilom veku rodičov alebo opakovaných potratoch. Tiež keď prenatálny skríning ukáže zvýšené riziko.
Proces začína zberom rodinnej anamnézy - genetik si nakreslí rodokmeň až do tretej generácie. Následujú genetické testy: karyotypizácia analyzuje chromozómy, molekulárne testy hľadajú špecifické mutácie, biochemické testy merajú enzymatickú aktivitu.
💡 Pamätaj: Genetické poradenstvo je nedirektívne - poradca ti nepovie, čo máš robiť, len ti poskytne všetky informácie na vlastné rozhodnutie.
Výsledkom je odhad rizika a možnosti prevencie alebo včasnej diagnostiky. Moderná genetika dokáže odhaliť predispozíciu k mnohým chorobám ešte pred ich vypuknutím.

Genetika prináša nielen nádej, ale aj zložité etické otázky, ktoré nemajú jednoduché odpovede. Tieto dilemy budú čoraz aktuálnejšie vo vašej generácii.
Prenatálna diagnostika umožňuje odhaliť genetické choroby už pred narodením. Ale čo robiť s touto informáciou? Je etické ukončiť tehotenstvo kvôli Downovmu syndrómu? Kde je hranica medzi prevenciou chorôb a selekciou "dokonalých" detí?
Genetické testovanie môže odhaliť predispozíciu k Alzheimerovej chorobe alebo rakovine. Chceš vedieť, že v 50 rokoch ochorieš na chorobu, ktorú nevieš vyliečiť? Kto má právo na tieto informácie - zamestnávateľ, poisťovňa?
💡 Zamysli sa: Máš právo nevedieť o svojej genetickej budúcnosti? Alebo máš povinnosť vedieť kvôli svojej rodine?
CRISPR/Cas9 technológia dokáže "vyrezať" a "vložiť" kúsky DNA s chirurgickou presnosťou. Môžeme vyliečiť genetické choroby, ale môžeme aj vytvoriť "dizajnérske deti" s vybranými vlastnosťami. Génová terapia má obrovský potenciál, ale klonovanie ľudí zostává tabu.

Genetické úlohy vyzerajú komplikovane, ale s dobrým systémom sú celkem zvládnuteľné. Tu je praktický príklad autozómovo recesívnej dedičnosti.
Anna a Peter sú zdraví, ale v oboch rodinách sa vyskytla cystická fibróza. Aká je pravdepodobnosť, že ich dieťa bude choré?
Krok 1: Označ alely - A = zdravá (dominantná), a = CF (recesívna). Krok 2: Ak majú súrodencov s CF (aa), rodičia musia byť Aa × Aa. Krok 3: Anna je zdravá, takže nie je aa. Z možností AA, Aa, Aa má 2/3 šancu byť prenášačka. Rovnako Peter.
Krok 4: Pravdepodobnosť, že dieťa bude aa = P(Anna je Aa) × P(Peter je Aa) × P(aa zo skríženia Aa × Aa) = 2/3 × 2/3 × 1/4 = 1/9.
💡 Tajomstvo úspechu: Vždy si nakresli rodokmeň a Punnettov štvorec. Vizualizácia je kľúčom k pochopeniu!
Pre X-viazané choroby je to ešte jednoduchšie - muži majú len jeden X chromozóm, takže stačí jedna recesívna alela na prejavenie choroby.




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Paul T
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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 Knowunity AI. 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
Genetika človeka je úžasná oblasť biológie, ktorá ti vysvetlí, prečo máš maminé oči alebo tatkov nos. Študuje, ako sa vlastnosti prenášajú z generácie na generáciu a prečo vznikajú dedičné choroby. Táto téma je super užitočná, lebo ti pomôže pochopiť nielen... Show more

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Keď sa pozrieš do zrkadla, vidíš výsledok milionov rokov evolúcie a jedinečnú kombináciu génov od tvojich rodičov. Genetika človeka aplikuje základné princípy dedičnosti špecificky na náš druh.
Najdôležitejšie pojmy, ktoré musíš ovládať: Gén je základná jednotka dedičnosti - kúsok DNA, ktorý kóduje určitú bielkovinu. Alela je konkrétna forma génu - napríklad gén pre farbu očí môže mať alelu pre modré alebo hnedé oči.
Genotyp je tvoja kompletná genetická výbava, zatiaľ čo fenotyp je to, čo skutočne vidíš - farba očí, výška, krvná skupina. Dominantné alely sa prejavia aj v jednej kópii, recesívne potrebujú dve kópie na prejavenie.
💡 Tip na zapamätanie: Dominantná alela je ako hlasný spolužiak - stačí jedna a už ju počuješ. Recesívna je ako tichý spolužiak - potrebuješ dve, aby sa prejavila.
Homozygot má dve rovnaké alely (AA alebo aa), heterozygot má rôzne alely (Aa). Karyotyp je kompletná sada tvojich chromozómov - normálne 46,XX pre ženy alebo 46,XY pre mužov.

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Predstav si, že jeden pokazený gén môže spôsobiť vážnu chorobu - presne o tom sú monogénne choroby. Sú tri hlavné typy dedičnosti, ktoré musíš rozlíšiť.
Autozómovo dominantná dedičnosť znamená, že choroba sa prejaví už pri jednej pokazenej kópii génu. Typický príklad je Huntingtonova choroba - neurodegeneratívne ochorenie, ktoré sa prejaví v dospelosti. Ak má jeden rodič túto chorobu, každé dieťa má 50% šancu na dedičnosť.
Autozómovo recesívna dedičnosť vyžaduje dve pokazené kópie génu. Cystická fibróza postihuje pľúca a tráviaci systém, ale prejaví sa len vtedy, ak dieťa zdedí defektnú alelu od oboch rodičov. Zdraví rodičia môžu byť prenášači a ani o tom nevedia.
💡 Zaujímavosť: Fenylketonúria (PKU) sa u nás testuje u všetkých novorodencov! Včasné odhalenie môže predísť poškodeniu mozgu.
X-viazaná recesívna dedičnosť postihuje hlavne mužov, lebo majú len jeden X chromozóm. Hemofília a farbosleposť sú klasické príklady - ženy sú často len prenášačky, muži sú postihnutí.

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Nie všetky choroby spôsobuje jeden gén - väčšina je oveľa komplikovanejšia. Polygenné choroby vznikajú kombináciou viacerých génov plus vplyv prostredia.
Diabetes 2. typu, srdcové choroby alebo astma patria medzi tieto komplexné ochorenia. Nemajú jednoduchý dedičný vzor a nemôžeš ich predpovedať len z rodinnej anamnézy. Preto je takáto dôležitá prevencia - zdravý životný štýl môže "prepísať" genetickú predispozíciu.
Chromozómové aberácie sú úplne iná kategória. Trizómie znamenajú jeden chromozóm navyše - Downov syndróm (trizómia 21) je najznámejší príklad. Monozómie znamenajú chýbajúci chromozóm - Turnerov syndróm (45,X) postihuje ženy.
💡 Dôležité: Riziko chromozómových aberácií rastie s vekom matky, preto sa odporúča genetické poradenstvo po 35. roku života.
Klinefelterov syndróm (47,XXY) postihuje mužov a spôsobuje neplodnosť. Štrukturálne aberácie ako delécie alebo translokácie môžu byť balancované (jedinec je zdravý) alebo nebalancované (spôsobujú chorobu).

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Genetické poradenstvo nie je len pre "problémové" rodiny - môže byť užitočné pre každého, kto plánuje deti. Je to komplexný proces, ktorý ti pomôže pochopiť tvoje genetické riziká.
Kedy ho potrebuješ? Ak sa v rodine vyskytla dedičná choroba, pri príbuzenskom manželstve, pokročilom veku rodičov alebo opakovaných potratoch. Tiež keď prenatálny skríning ukáže zvýšené riziko.
Proces začína zberom rodinnej anamnézy - genetik si nakreslí rodokmeň až do tretej generácie. Následujú genetické testy: karyotypizácia analyzuje chromozómy, molekulárne testy hľadajú špecifické mutácie, biochemické testy merajú enzymatickú aktivitu.
💡 Pamätaj: Genetické poradenstvo je nedirektívne - poradca ti nepovie, čo máš robiť, len ti poskytne všetky informácie na vlastné rozhodnutie.
Výsledkom je odhad rizika a možnosti prevencie alebo včasnej diagnostiky. Moderná genetika dokáže odhaliť predispozíciu k mnohým chorobám ešte pred ich vypuknutím.

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Genetika prináša nielen nádej, ale aj zložité etické otázky, ktoré nemajú jednoduché odpovede. Tieto dilemy budú čoraz aktuálnejšie vo vašej generácii.
Prenatálna diagnostika umožňuje odhaliť genetické choroby už pred narodením. Ale čo robiť s touto informáciou? Je etické ukončiť tehotenstvo kvôli Downovmu syndrómu? Kde je hranica medzi prevenciou chorôb a selekciou "dokonalých" detí?
Genetické testovanie môže odhaliť predispozíciu k Alzheimerovej chorobe alebo rakovine. Chceš vedieť, že v 50 rokoch ochorieš na chorobu, ktorú nevieš vyliečiť? Kto má právo na tieto informácie - zamestnávateľ, poisťovňa?
💡 Zamysli sa: Máš právo nevedieť o svojej genetickej budúcnosti? Alebo máš povinnosť vedieť kvôli svojej rodine?
CRISPR/Cas9 technológia dokáže "vyrezať" a "vložiť" kúsky DNA s chirurgickou presnosťou. Môžeme vyliečiť genetické choroby, ale môžeme aj vytvoriť "dizajnérske deti" s vybranými vlastnosťami. Génová terapia má obrovský potenciál, ale klonovanie ľudí zostává tabu.

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Genetické úlohy vyzerajú komplikovane, ale s dobrým systémom sú celkem zvládnuteľné. Tu je praktický príklad autozómovo recesívnej dedičnosti.
Anna a Peter sú zdraví, ale v oboch rodinách sa vyskytla cystická fibróza. Aká je pravdepodobnosť, že ich dieťa bude choré?
Krok 1: Označ alely - A = zdravá (dominantná), a = CF (recesívna). Krok 2: Ak majú súrodencov s CF (aa), rodičia musia byť Aa × Aa. Krok 3: Anna je zdravá, takže nie je aa. Z možností AA, Aa, Aa má 2/3 šancu byť prenášačka. Rovnako Peter.
Krok 4: Pravdepodobnosť, že dieťa bude aa = P(Anna je Aa) × P(Peter je Aa) × P(aa zo skríženia Aa × Aa) = 2/3 × 2/3 × 1/4 = 1/9.
💡 Tajomstvo úspechu: Vždy si nakresli rodokmeň a Punnettov štvorec. Vizualizácia je kľúčom k pochopeniu!
Pre X-viazané choroby je to ešte jednoduchšie - muži majú len jeden X chromozóm, takže stačí jedna recesívna alela na prejavenie choroby.

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Join milions of students
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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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 Knowunity AI. 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 Knowunity AI. 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