---
title: Megalodon and the giants of the sea, past and present — how Mova does on the tests · Biology
description: Lesson 273 of the biology course of Mova's primary school: 6 of 11 tests right, exam 2 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

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# Megalodon and the giants of the sea, past and present

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**Tests:** 6 of 11 right · **Exam:** 2 of 4 right · **Kind:** ★ · **Understood:** 8 of 15 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 273 of the biology course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: [the lesson in the corpora](https://md.mova.elamur.ai/free/en/corpora/school/biology/273-megalodon-and-the-giants-of-the-sea/).

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Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: [the lesson's questions in the corpora](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/).

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### Test 1 · ★ · wrong ✗ {#t1}

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«saw The Meg, megalodon's still down there in the deep innit» What is right?

- **1.** Yes, it lives in the Mariana Trench, where it is too deep and dark to be filmed — **← Mova's choice** · no support
- **2.** Yes, a young one is kept in a secret aquarium — no support
- **3.** No, it is extinct; a shark that big would leave teeth, bitten whales and sightings — **✓ the right answer** · no support
- **4.** No, it slowly turned into the blue whale — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/t1/)

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### Test 2 · ★ · wrong ✗ {#t2}

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«megalodon is the biggest animal ever, end of» What is true?

- **1.** No, a T. rex was bigger and heavier than it — **← Mova's choice** · no support
- **2.** Yes, nothing at all was ever bigger than it — no support
- **3.** No, the blue whale alive today is bigger — **✓ the right answer** · no support
- **4.** No, a giant squid is bigger — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/t2/)

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### Test 3 · ★ · right ✓ {#t3}

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Count them: a beach has 4 kids, and each finds 3 shark teeth. How many teeth in all?

- **1.** 12 — **← Mova's choice** · **✓ the right answer** · no support
- **2.** 16 — no support
- **3.** 4 — no support
- **4.** 7 — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/t3/)

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### Test 4 · ★ · right ✓ {#t4}

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What would happen to megalodon when the seas cooled and its whale prey moved to cold water?

- **1.** It could not follow and lost much of its food — **← Mova's choice** · **✓ the right answer** · score 9
- **2.** It grew a thick coat of fur and followed the whales — score 3
- **3.** It crawled out of the sea and lived on land — score 3
- **4.** It started eating seaweed instead of meat — score 3

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**Why:** It took the question to ask what happens next. It chose option 1 with score 9, against 3 for the next best. Its support: lesson 273, line 7: «Megalodon is extinct: no fresh teeth, bitten whales or sightings are found; as the seas cooled, its whale prey moved to cold water it could not follow.», reached through what followed the sentence the question matched. What matched: the same action «follow» (+6); the same doer «prey» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/t4/)

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### Test 5 · ★ · right ✓ {#t5}

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«coelacanth was extinct and then came back to life, that's magic» What is better?

- **1.** It never died out; it lived deep down where few people looked — **← Mova's choice** · **✓ the right answer** · score 9
- **2.** It was a different fish that just had the same name as the old one — no support
- **3.** It came from space — no support
- **4.** Scientists brought it back to life from a fossil in a laboratory — score 1

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 9, against 1 for the next best. Its support: lesson 273, line 13: «The coelacanth was thought extinct for 66 million years until one was caught off South Africa in 1938; it lives deep down, and its fleshy fins move like legs.», reached through the option's own match among the sentences about the question's things. What matched: the same action «live» (+3); the same doer «coelacanth» (+3); the same property (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/t5/)

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### Test 6 · ★ · wrong ✗ {#t6}

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In a cartoon a megalodon chases a submarine through the shallows. Which real fact fits the shallows?

- **1.** Megalodons were born on land and then crawled to sea — **← Mova's choice** · no support
- **2.** Megalodons never went near shallow water in their lives — no support
- **3.** Young megalodons grew up in warm, shallow nurseries — **✓ the right answer** · no support
- **4.** Submarines are what megalodons ate — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/t6/)

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### Test 7 · ★ · right ✓ {#t7}

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«how does a fish bite without teeth lol» How did Dunkleosteus do it?

- **1.** It used its tail — score 7
- **2.** It sucked prey in like a vacuum — score 5
- **3.** With sharp bony blades in its jaws — **← Mova's choice** · **✓ the right answer** · score 9
- **4.** It did not bite at all — score 7

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**Why:** It took the question to ask what something is like. It chose option 3 with score 9, against 7 for the next best. Its support: lesson 188, line 11: «The geography cone snail stings fish with a harpoon-like tooth and has one of the deadliest venoms, so people should never pick up cone shells.», reached through the option's own match among the sentences about the question's things. What matched: the same action «sting» (+4); the same circumstance (+4); a different doer (counts against) (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/t7/)

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### Test 8 · ★ · right ✓ {#t8}

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Why did the great white and megalodon probably compete?

- **1.** They ate at the same level of the food chain — **← Mova's choice** · **✓ the right answer** · score 7
- **2.** They were the very same species — no support
- **3.** They both ate the same kinds of seaweed — no support
- **4.** They shared one cave and fought over who slept there — no support

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**Why:** It took the question to ask why something happens (its cause). It chose option 1 with score 7, the only option with support. Its support: lesson 273, line 8: «Great white sharks competed for the same food, and tooth chemistry suggests they ate at the same level of the food chain, so they may have helped finish megalo…», reached through the same lesson line as the sentence the question matched. What matched: the same action «eat» (+4); the same place «same level» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/t8/)

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### Test 9 · ★ · right ✓ {#t9}

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Giant squid tentacles wash up on a beach. Why are giant squid so rarely seen alive?

- **1.** They live deep down in the dark sea — **← Mova's choice** · **✓ the right answer** · score 13
- **2.** They live only high up in the mountains — score 5
- **3.** They hide in rivers and lakes — no support
- **4.** They are invisible to our eyes — no support

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**Why:** It took the question to ask why something happens (its cause). It chose option 1 with score 13, against 5 for the next best. Its support: lesson 273, line 15: «Giant squid live deep down in the dark sea, so they are rarely seen; they can be about 12 metres long with their tentacles and were first filmed alive in 2004;…», reached through the cause of the sentence the question matched. What matched: the same action «live» (+6); the same place «dark sea» (+4); the same property (+4). Against it: a different doer (counts against) (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/t9/)

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### Test 10 · ★ · wrong ✗ {#t10}

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A cartoon shows a sea scorpion the size of a beetle. What could the real biggest ones be?

- **1.** As big as a blue whale — **← Mova's choice** · no support
- **2.** As big as an island — no support
- **3.** Smaller than an ant — no support
- **4.** Longer than a man — **✓ the right answer** · no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/t10/)

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### Test 11 · ★ · wrong ✗ {#t11}

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«Leviathan's just a monster from an old story» Which real animal is named after it?

- **1.** Megalodon — **← Mova's choice** · score 7
- **2.** The coelacanth — score 7
- **3.** Livyatan, a whale with huge teeth — **✓ the right answer** · score 7
- **4.** The giant squid — score 7

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**Why:** It took the question to ask what it is done to. It chose option 1 with score 7, tied with another option at 7 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 95, line 18: «Night animals sleep by day in burrows, tree holes and dark corners, guided by their body clock; animals most active at dawn and dusk, like rabbits and deer, ar…», reached through the remembered sentence the question matched. What matched: the same action «call» (+4); the same circumstance (+3). The right option, 3, scored 7. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/t11/)

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### Exam question 1 · formal language · wrong ✗ {#e1}

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Identify the evidence that most strongly indicates the extinction of megalodon.

- **1.** The discovery of the final individual, stranded upon a beach in 1900 — **← Mova's choice** · no support
- **2.** The testimony of a cinematic production — no support
- **3.** A decree issued by a scientific society declaring the species to be extinct — no support
- **4.** The absence of recent teeth, bitten whale remains and reliable sightings — **✓ the right answer** · no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/e1/)

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### Exam question 2 · formal language · right ✓ {#e2}

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Select the response consistent with the established facts concerning the largest animal known to have existed.

- **1.** It is the giant squid — no support
- **2.** It is the blue whale, which survives at the present day — **← Mova's choice** · **✓ the right answer** · score 8
- **3.** It is megalodon — no support
- **4.** It is Argentinosaurus — no support

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 8, the only option with support. Its support: lesson 273, line 14: «The blue whale is the biggest animal known ever to have lived, up to about 30 metres long, because water holds up its weight.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «blue whale» (+3); the same light verb (be, have, do, get, go) (+3); the same thing acted on «biggest animal» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/e2/)

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### Exam question 3 · formal language · right ✓ {#e3}

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Ascertain the circumstances of the rediscovery of the coelacanth.

- **1.** A fossil was restored to life by scientists by means of preserved material — no support
- **2.** The species was first described in an ancient legend — no support
- **3.** A frozen specimen was recovered from Siberian permafrost alongside the remains of the mammoth — no support
- **4.** A living specimen was taken off South Africa in 1938, the species having been presumed extinct — **← Mova's choice** · **✓ the right answer** · score 2

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 2, the only option with support. Its support: lesson 273, line 13: «The coelacanth was thought extinct for 66 million years until one was caught off South Africa in 1938; it lives deep down, and its fleshy fins move like legs.», reached through a sentence linked to the one the question matched. What matched: the same place «1938» (+2); the same circumstance (+2). Against it: a different action (counts against) (-1); a different thing acted on (counts against) (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/e3/)

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### Exam question 4 · formal language · wrong ✗ {#e4}

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Which of the following statements most accurately characterises the dentition of sharks?

- **1.** Each shark possesses a single set of teeth which must serve for the whole of its life — **← Mova's choice** · no support
- **2.** Teeth are shed and replaced continually, thousands being produced over a lifetime — **✓ the right answer** · no support
- **3.** Teeth are replaced only once, in old age — no support
- **4.** Sharks are entirely without teeth — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/273-megalodon-and-the-giants-of-the-sea/e4/)

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