---
title: Wolves in Yellowstone, beavers in Britain and bringing nature back — how Mova does on the tests · Biology
description: Lesson 283 of the biology course of Mova's primary school: 7 of 12 tests right, exam 3 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

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# Wolves in Yellowstone, beavers in Britain and bringing nature back

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**Tests:** 7 of 12 right · **Exam:** 3 of 4 right · **Kind:** ★ · **Understood:** 12 of 16 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 283 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/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/).

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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/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/).

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### Test 1 · ★ · right ✓ {#t1}

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In Little Red Riding Hood the wolf eats grandma. What is true about real wolves?

- **1.** Wolves often dress up as people — score 4
- **2.** Wild wolves are shy and attacks on people are very rare — **← Mova's choice** · **✓ the right answer** · score 9
- **3.** Wolves eat people whole — score 4
- **4.** Wolves hunt grandmothers in forests, just as the old stories say — score 4

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 9, against 4 for the next best. Its support: lesson 283, line 16: «Wild wolves are shy, and attacks on people are very rare; old stories like Little Red Riding Hood come from times when people feared wolves and lost livestock.», reached through the option's own match among the sentences about the question's things. What matched: the same property (+4); the same light verb (be, have, do, get, go) (+3); the same doer «wild wolves» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/t1/)

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### Test 2 · ★ · right ✓ {#t2}

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In cartoons a wolf always howls at a big full moon. What is right?

- **1.** Wolves howl to make the moon rise — score 5
- **2.** Wolves howl to call their pack at any time, and the moon has nothing to do with it — **← Mova's choice** · **✓ the right answer** · score 9
- **3.** Wolves howl because the bright light of the full moon hurts their eyes at night — score 4
- **4.** Wolves can only howl at a full moon — score 5

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 9, against 5 for the next best. Its support: lesson 283, line 17: «Wolves howl to call their pack and warn other packs, at any time of night or day; they point their heads up because the sound carries further, and the moon has…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «nothing» (+3); the same light verb (be, have, do, get, go) (+3); the same doer «moon» (+2); its «because» matches the remembered cause (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/t2/)

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### Test 3 · ★ · right ✓ {#t3}

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«my brother says he's the alpha wolf of the house» Where did the idea of the alpha wolf come from?

- **1.** Old Roman wolf laws — score 5
- **2.** Studies of wild wolf families for hundreds of years — no support
- **3.** Zoo studies of unrelated wolves; wild packs are families led by mum and dad — **← Mova's choice** · **✓ the right answer** · score 9
- **4.** A wolf that won a fight with a bear — score -1

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**Why:** It took the question to ask where. It chose option 3 with score 9, against 5 for the next best. Its support: lesson 24, line 6: «The idea of an alpha wolf fighting its way to the top came from captive wolves; wild packs are mostly parents leading their family.», reached through the same lesson line as the sentence the question matched. What matched: the same action «lead» (+4); the same thing acted on «family» (+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/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/t3/)

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### Test 4 · ★ · wrong ✗ {#t4}

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Count them: a wolf family has mum, dad and 4 cubs. How many legs, ears and tails are there?

- **1.** 16 legs, 12 ears and 6 tails — **← Mova's choice** · score 1
- **2.** 24 legs, 12 ears and 6 tails — **✓ the right answer** · score 1
- **3.** 24 legs, 6 ears and 6 tails — score 1
- **4.** 24 legs, 12 ears and 4 tails — score 1

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**Why:** It took the question to ask what it is done to. It chose option 1 with score 1, tied with another option at 1 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 207, line 13: «A foal stands and walks within a few hours of birth, on legs that are very long for its body, because a wild foal must keep up with the herd.», reached through the option's own match among the sentences about the question's things. What matched: the same light verb (be, have, do, get, go) (+1); it fills the role the question asks for (+1). Against it: the same doer «legs» (-1). The right option, 2, scored 1. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/t4/)

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### Test 5 · ★ · wrong ✗ {#t5}

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What would happen to young willow trees by a river if all the wolves were taken away again?

- **1.** The rivers would dry up the very next day and the trees would all die — **← Mova's choice** · score 1
- **2.** The trees would grow faster — score 1
- **3.** Elk would graze there more and many young trees might be eaten — **✓ the right answer** · score 1
- **4.** The trees would turn into aspens — score 1

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**Why:** It took the question to ask what happens next. It chose option 1 with score 1, tied with another option at 1 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 13, line 12: «The Andean condor has wings about 3 metres across and glides on rising air; one was found to fly over 170 kilometres without flapping once.», reached through what followed the sentence the question matched. What matched: the same doer «one» (+2). Against it: a different action (counts against) (-1). The right option, 3, scored 1. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/t5/)

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### Test 6 · ★ · wrong ✗ {#t6}

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«why would anyone want wolves back, they just eat stuff» What is the best answer?

- **1.** Wolves eat only grass — **← Mova's choice** · score 2
- **2.** Wolves are only wanted so that tourists can take photos of them for their friends — score 2
- **3.** They do not matter at all — no support
- **4.** Top predators shape the whole food web, helping trees, beavers and birds — **✓ the right answer** · no support

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**Why:** It took the question to ask why something happens (its cause). 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 283, line 8: «A trophic cascade is a change at the top of a food chain that ripples down: wolves eat elk, elk eat trees, and trees shade streams and feed beavers.», reached through the option's own match among the sentences about the question's things. What matched: the same action «eat» (+3). Against it: the same doer «wolves» (-1). The right option, 4, 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/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/t6/)

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### Test 7 · ★ · wrong ✗ {#t7}

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«a beaver's back in our river, it'll ruin everything» What is fairest?

- **1.** Beavers always destroy towns — **← Mova's choice** · no support
- **2.** Beaver dams slow floods and make ponds full of life, but some farmers worry about flooded fields — **✓ the right answer** · no support
- **3.** Beavers are dangerous to children — no support
- **4.** Beavers bring nothing but floods — 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/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/t7/)

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### Test 8 · ★ · right ✓ {#t8}

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«lynx in Scotland?? they'll eat kids» What is right?

- **1.** Lynx eat only sheep — score 2
- **2.** Lynx are shy, eat deer and are not known to attack people — **← Mova's choice** · **✓ the right answer** · score 9
- **3.** Lynx are as big as lions and hunt anything they can find — no support
- **4.** Yes, lynx hunt children — no support

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 9, against 2 for the next best. Its support: lesson 283, line 13: «Lynx are shy wild cats that eat deer and are not known to attack people; some people want them back in Scotland, some farmers fear for their sheep, and it is d…», reached through the option's own match among the sentences about the question's things. What matched: the same property (+4); the same light verb (be, have, do, get, go) (+3); the same doer «lynx» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/t8/)

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### Test 9 · ★ · right ✓ {#t9}

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Count them: a stork pair on a chimney has 3 chicks. How many legs and wings are there in the nest?

- **1.** 10 legs and 10 wings — **← Mova's choice** · **✓ the right answer** · score 1
- **2.** 10 legs and 5 wings — score 1
- **3.** 6 legs and 6 wings — score 1
- **4.** 20 legs and 10 wings — score 1

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**Why:** It took the question to ask what it is done to. It chose option 1 with score 1, tied with another option at 1 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 207, line 13: «A foal stands and walks within a few hours of birth, on legs that are very long for its body, because a wild foal must keep up with the herd.», reached through the option's own match among the sentences about the question's things. What matched: the same light verb (be, have, do, get, go) (+1); it fills the role the question asks for (+1). Against it: the same doer «legs» (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/t9/)

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### Test 10 · ★ · right ✓ {#t10}

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«they said the wolves changed the rivers, so wolves dig rivers?» What really happened?

- **1.** Wolves changed how elk moved, which helped trees in some places, and that helped beavers and birds — **← Mova's choice** · **✓ the right answer** · score 5
- **2.** Wolves drank the rivers dry — no support
- **3.** Wolves dug new rivers with their paws — score 3
- **4.** Wolves carried stones to make dams — score 3

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 5, against 3 for the next best. Its support: lesson 283, line 7: «Wolves helped willows and aspens in some places, which helped beavers and birds; scientists say the story is more complicated than «wolves changed the rivers»,…», reached through the option's own match among the sentences about the question's things. What matched: the same place «places» (+4); the same action «help» (+2). Against it: 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/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/t10/)

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### Test 11 · ★ · wrong ✗ {#t11}

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A farm that was hard to farm is left wild. What might happen, as at Knepp?

- **1.** It would turn into a desert — **← Mova's choice** · no support
- **2.** It would fill up with lions — no support
- **3.** All the animals would leave — no support
- **4.** Missing birds like nightingales and turtle doves might come back — **✓ 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/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/t11/)

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### Test 12 · ★ · right ✓ {#t12}

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«why'd they pay the farmer, the wolf ate his sheep not them» What is the reason?

- **1.** It is a reward for every wolf the farmer shoots on his land — score 0
- **2.** The farmer sold the sheep to the wolf — score 0
- **3.** Farmers are paid to feed wolves — score 5
- **4.** Fair rules help farmers and wild animals live side by side — **← Mova's choice** · **✓ the right answer** · score 9

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**Why:** It took the question to ask why something happens (its cause). It chose option 4 with score 9, against 5 for the next best. Its support: lesson 283, line 10: «Wolves sometimes kill sheep and cattle near parks; farmers are paid for losses, and guard dogs, fences and lights help keep wolves away, so that farmers and wi…», reached through the same lesson line as the sentence the question matched. What matched: the same action «live» (+4); the same doer «farmers» (+2); the same circumstance (+2); the same thing acted on «side» (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/t12/)

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

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Identify the phenomenon whereby a change in the population of a top predator affects successive levels of a food chain.

- **1.** Metamorphosis — no support
- **2.** Natural selection — no support
- **3.** Hibernation — no support
- **4.** A trophic cascade — **← Mova's choice** · **✓ the right answer** · score 6

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 6, the only option with support. Its support: lesson 283, line 8: «A trophic cascade is a change at the top of a food chain that ripples down: wolves eat elk, elk eat trees, and trees shade streams and feed beavers.», reached through the option's own match among the sentences about the question's things. What matched: the same property (+4); the same doer «trophic cascade» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/e1/)

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

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State the number of wolves reintroduced to Yellowstone National Park in 1995 and 1996, and the country of their origin.

- **1.** Three hundred and ten, from Russia — **← Mova's choice** · no support
- **2.** Thirty-one, from Scotland — no support
- **3.** Thirteen, from Mexico — no support
- **4.** Thirty-one, from Canada — **✓ 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/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/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 howling of wolves.

- **1.** It is directed at the moon by reason of the light it emits — no support
- **2.** It is performed exclusively upon nights of the full moon — no support
- **3.** It serves to summon the pack and to warn other packs, and bears no relation to the moon — **← Mova's choice** · **✓ the right answer** · score 5
- **4.** It signifies that the wolf is in pain — no support

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**Why:** It took the question to ask which statement is true. It chose option 3 with score 5, the only option with support. Its support: lesson 283, line 17: «Wolves howl to call their pack and warn other packs, at any time of night or day; they point their heads up because the sound carries further, and the moon has…», reached through the same lesson line as the sentence the question matched. What matched: the same thing acted on «other packs» (+3); the same action «warn» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/e3/)

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### Exam question 4 · formal language · right ✓ {#e4}

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Which of the following statements most accurately characterises the structure of a wild wolf pack?

- **1.** A family led by the parents — **← Mova's choice** · **✓ the right answer** · no support
- **2.** A group composed exclusively of male wolves — no support
- **3.** A temporary gathering for the duration of winter — no support
- **4.** An assembly of unrelated wolves under a single dominant male — 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/283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back/e4/)

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- ← previous: [282. Comeback stories: bald eagles, humpback whales,…](https://md.mova.elamur.ai/free/en/school-run/biology/282-comeback-stories-bald-eagles-humpback-whales-condors-and-the-kakapo/)
- next →: [284. Conservation heroes: Attenborough, Goodall, Cars…](https://md.mova.elamur.ai/free/en/school-run/biology/284-conservation-heroes-attenborough-goodall-carson-maathai-and-the-rangers/)
- ↑ back to [Biology](https://md.mova.elamur.ai/free/en/school-run/biology/)