---
title: More record-breakers and oddballs: sloth, narwhal, chameleon, electr… — how Mova does on the tests · Biology
description: Lesson 45 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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# More record-breakers and oddballs: sloth, narwhal, chameleon, electric eel, giraffe

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

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Lesson 45 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/45-sloth-narwhal-chameleon-eel-giraffe/).

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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/45-sloth-narwhal-chameleon-eel-giraffe/).

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### Test 1 · wrong ✗ {#t1}

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«sloths are just lazy lol, imagine sleeping all day» What is right?

- **1.** Yes, they are simply lazy — **← Mova's choice** · score 7
- **2.** No, sloths are actually the fastest climbers in the whole rainforest — no support
- **3.** Slowness saves energy, because their leaves give so little of it — **✓ the right answer** · score 2
- **4.** Yes, and they are ill most of the time — no support

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 7, against 2 for the next best. Its support: lesson 45, line 4: «Cartoons get these animals wrong all the time: the chameleon turns tartan on a picnic rug, the sloth is lazy, and the narwhal's tusk is a unicorn horn; the rea…», reached through the remembered sentence the question matched. What matched: the same property (+3); the same doer «sloth» (+2); the same light verb (be, have, do, get, go) (+2). The right option, 3, scored 2. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/45-sloth-narwhal-chameleon-eel-giraffe/t1/)

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### Test 2 · right ✓ {#t2}

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In a cartoon a chameleon on a picnic rug turns into a perfect tartan. What does a real one do?

- **1.** Stays the same colour all its life — no support
- **2.** Changes colour mostly to signal or to warm up or cool down — **← Mova's choice** · **✓ the right answer** · score 7
- **3.** Copies any pattern it sits on, even tartan, stripes and spots — no support
- **4.** Turns see-through — no support

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**Why:** It took the question to ask what is done. It chose option 2 with score 7, the only option with support. Its support: lesson 45, line 11: «Chameleons change colour mostly to signal to other chameleons and to warm up or cool down, not to match any background; a cold chameleon turns darker to soak u…», reached through the option's own match among the sentences about the question's things. What matched: it fills the role the question asks for (+3); the same action «change» (+2); the same thing acted on «colour» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/45-sloth-narwhal-chameleon-eel-giraffe/t2/)

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### Test 3 · wrong ✗ {#t3}

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«narwhal tusk = unicorn horn, so unicorns were real» What is right?

- **1.** No, the tusk is made of ice — **← Mova's choice** · no support
- **2.** The tusk is a narwhal's tooth, once sold as a unicorn horn — **✓ the right answer** · no support
- **3.** Yes, narwhals are sea unicorns with horns of bone on their foreheads — no support
- **4.** Yes, unicorns lived in the Arctic — no support

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**Why:** Nothing it remembers matched the question, 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/45-sloth-narwhal-chameleon-eel-giraffe/t3/)

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### Test 4 · wrong ✗ {#t4}

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«giraffe's got a long neck so it must have like 50 neck bones» What is right?

- **1.** Yes, about 50, that's why it bends so well — no support
- **2.** It has no bones in its neck at all — **← Mova's choice** · score 9
- **3.** It has 7, like us; each bone is just very long — **✓ the right answer** · no support
- **4.** It has about 25, like a snake — no support

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 9, the only option with support. Its support: lesson 45, line 15: «A giraffe has 7 neck bones like almost all mammals, each up to about 25 cm long; sloths and manatees are among the few mammals with a different number.», reached through the remembered sentence the question matched. What matched: the same thing acted on «7 neck bones» (+5); the same doer «giraffe» (+2); the same light verb (be, have, do, get, go) (+2). The right option, 3, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/45-sloth-narwhal-chameleon-eel-giraffe/t4/)

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### Test 5 · wrong ✗ {#t5}

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Do you think a mouse has more or fewer neck bones than a giraffe?

- **1.** None at all, it is too small — **← Mova's choice** · no support
- **2.** The same, 7 — **✓ the right answer** · no support
- **3.** More, about 20 — no support
- **4.** Fewer, about 2 — 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/45-sloth-narwhal-chameleon-eel-giraffe/t5/)

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### Test 6 · wrong ✗ {#t6}

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What would happen if a giraffe's heart were as weak as ours for its size?

- **1.** It would grow even taller — score 2
- **2.** Nothing, any heart at all can pump blood that high up — score 3
- **3.** Not enough blood would reach its brain high up — **✓ the right answer** · no support
- **4.** It would have to drink twice as much — **← Mova's choice** · score 4

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**Why:** It took the question to ask what happens next. It chose option 4 with score 4, against 3 for the next best. Its support: lesson 44, line 4: «Games and memes call tardigrades indestructible and say mantis shrimps see a rainbow we cannot imagine; the truth is cleverer, because the tardigrade survives…», reached through what followed the sentence the question matched. What matched: the same doer «games» (+4). The right option, 3, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/45-sloth-narwhal-chameleon-eel-giraffe/t6/)

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### Test 7 · right ✓ {#t7}

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«don't touch the eel tank mate, it's like a socket» Why is he right?

- **1.** An electric eel can give a shock of hundreds of volts — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Eels bite with poisonous fangs — no support
- **3.** Eels can jump out of the tank and strangle you — no support
- **4.** The tank is full of sea water that burns your skin off — 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/45-sloth-narwhal-chameleon-eel-giraffe/t7/)

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### Test 8 · right ✓ {#t8}

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In a game, the electric eel lives in clear deep sea water and breathes with gills only. What is wrong?

- **1.** It lives in the sea but breathes through a hole in its tail like a whale — score 4
- **2.** Nothing, that is correct — no support
- **3.** It lives in the desert — score 4
- **4.** It lives in muddy rivers and must breathe air at the surface — **← Mova's choice** · **✓ the right answer** · score 9

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 9, against 4 for the next best. Its support: lesson 45, line 14: «Electric eels breathe air and must gulp at the surface every few minutes, and they send out weak electric pulses to sense things in murky water.», reached through the remembered sentence the question matched. What matched: the same thing acted on «air» (+5); the same action «breathe» (+2); the same doer «electric eels» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/45-sloth-narwhal-chameleon-eel-giraffe/t8/)

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### Test 9 · right ✓ {#t9}

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A chameleon is cold in the early morning. What colour change helps it?

- **1.** Turning darker to soak up more sunlight — **← Mova's choice** · **✓ the right answer** · score 8
- **2.** Turning bright green to hide from birds — no support
- **3.** Turning see-through — no support
- **4.** Turning white to stay cool — no support

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**Why:** It took the question to ask who or what does it. It chose option 1 with score 8, the only option with support. Its support: lesson 45, line 11: «Chameleons change colour mostly to signal to other chameleons and to warm up or cool down, not to match any background; a cold chameleon turns darker to soak u…», reached through the remembered sentence the question matched. What matched: its «because» matches the remembered cause (+4); the same action «turn» (+3); the same property (+2). 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/45-sloth-narwhal-chameleon-eel-giraffe/t9/)

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### Test 10 · right ✓ {#t10}

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Why could a green coat be useful for a sloth in the treetops?

- **1.** It makes the leaves it eats taste much better — score 3
- **2.** It keeps it warm — no support
- **3.** It may help it hide among leaves from harpy eagles — **← Mova's choice** · **✓ the right answer** · score 6
- **4.** It glows at night — no support

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**Why:** It took the question to ask why something happens (its cause). It chose option 3 with score 6, against 3 for the next best. Its support: lesson 45, line 6: «Algae grow in grooves in sloth fur, giving it a greenish tint that may help it hide from harpy eagles, and sloth moths and beetles live in the fur.», reached through the same lesson line as the sentence the question matched. What matched: the same action «hide» (+2); the same doer «sloth» (+2); the same circumstance (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/45-sloth-narwhal-chameleon-eel-giraffe/t10/)

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### Test 11 · right ✓ {#t11}

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«why does that chameleon look two ways at once, is it broken» What is right?

- **1.** It is about to faint — score 0
- **2.** It has a nasty eye disease and needs a vet — score 2
- **3.** Every animal can do that, you just never noticed — no support
- **4.** Its eyes move on their own, so it can watch all around — **← Mova's choice** · **✓ the right answer** · score 12

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**Why:** It took the question to ask why something happens (its cause). It chose option 4 with score 12, against 2 for the next best. Its support: lesson 45, line 12: «Each chameleon eye moves on its own, so it can look forward and backward at once; to catch an insect both eyes turn forward and its tongue shoots out, sometime…», reached through the cause of the sentence the question matched. What matched: the same action «move» (+5); the same place «own» (+5); the same doer «chameleon eye» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/45-sloth-narwhal-chameleon-eel-giraffe/t11/)

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### Exam question 1 · formal language · right ✓ {#e1}

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Which of the following statements most accurately characterises the slowness of the sloth?

- **1.** It conserves the little energy afforded by a diet of leaves — **← Mova's choice** · **✓ the right answer** · no support
- **2.** It is caused by an inability to sleep — no support
- **3.** It results from the weight of algae accumulated in the fur — no support
- **4.** It is a consequence of idleness without biological purpose — 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/45-sloth-narwhal-chameleon-eel-giraffe/e1/)

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### Exam question 2 · formal language · wrong ✗ {#e2}

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Identify the principal nature of the tusk of the narwhal.

- **1.** It is a horn arising from the centre of the forehead — **← Mova's choice** · no support
- **2.** It is a modified fin of hardened skin — no support
- **3.** It is a bone of the nose extended forward — no support
- **4.** It is a tooth, usually the left upper canine, protruding in a spiral through the lip — **✓ the right answer** · no support

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**Why:** Nothing it remembers matched the question, 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/45-sloth-narwhal-chameleon-eel-giraffe/e2/)

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

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Select the response consistent with the established facts concerning the neck of the giraffe.

- **1.** It contains seven bones, as in almost all mammals, each being very long — **← Mova's choice** · **✓ the right answer** · score 2
- **2.** It contains no bones, being supported by muscle alone — score 2
- **3.** It contains a greater number of bones than that of any other animal — score 2
- **4.** It contains a single elongated bone — score 2

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 2, tied with another option at 2 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 45, line 2: «A giraffe's neck looks as if it must have extra bones, but it has 7, exactly as many as yours; each one is just very long, up to about 25 cm, longer than a new…», reached through the option's own match among the sentences about the question's things. What matched: the same doer «neck» (+1); the same thing acted on «extra bones» (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/45-sloth-narwhal-chameleon-eel-giraffe/e3/)

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

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Ascertain the principal purpose for which chameleons alter their colouring.

- **1.** The exact imitation of any background upon which they rest — **← Mova's choice** · score 6
- **2.** Signalling to other chameleons and regulating body temperature — **✓ the right answer** · no support
- **3.** The repair of damaged skin — no support
- **4.** The attraction of insects to their tongue — no support

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 6, the only option with support. Its support: lesson 45, line 11: «Chameleons change colour mostly to signal to other chameleons and to warm up or cool down, not to match any background; a cold chameleon turns darker to soak u…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «chameleons» (+5); the same thing acted on «background» (+2). Against it: a different action (counts against) (-1). The right option, 2, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/45-sloth-narwhal-chameleon-eel-giraffe/e4/)

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- ← previous: [44. The axolotl, the tardigrade and the mantis shrimp](https://md.mova.elamur.ai/free/en/school-run/biology/44-axolotl-tardigrade-mantis-shrimp/)
- next →: [46. Food chains: sun, plants, plant-eaters, meat-eat…](https://md.mova.elamur.ai/free/en/school-run/biology/46-food-chains/)
- ↑ back to [Biology](https://md.mova.elamur.ai/free/en/school-run/biology/)