---
title: The end of the dinosaurs, and birds as living dinosaurs — how Mova does on the tests · Biology
description: Lesson 76 of the biology course of Mova's primary school: 3 of 11 tests right, exam 0 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

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# The end of the dinosaurs, and birds as living dinosaurs

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**Tests:** 3 of 11 right · **Exam:** 0 of 4 right · **Kind:** ★★ · **Understood:** 7 of 15 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 76 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/76-end-of-the-dinosaurs-and-birds/).

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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/76-end-of-the-dinosaurs-and-birds/).

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### Test 1 · ★★ · right ✓ {#t1}

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«dinos are extinct, so birds can't be dinosaurs, duh» What is right?

- **1.** Birds came from bats after the dinosaurs — score 3
- **2.** Birds have always existed and never changed — score 4
- **3.** Birds came from pterosaurs, not from dinosaurs, so they are flying reptiles — score 4
- **4.** Birds evolved from feathered theropods, so they are surviving dinosaurs — **← 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, against 4 for the next best. Its support: lesson 76, line 2: «But the dinosaurs did not all vanish: one branch of small feathered meat-eaters survived, and their great-great-grandchildren scratch for worms in the farmyard…», reached through the remembered sentence the question matched. What matched: the same thing acted on «dinosaurs» (+5); the same action «live» (+2). Against it: the same doer «birds» (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/76-end-of-the-dinosaurs-and-birds/t1/)

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### Test 2 · ★★ · wrong ✗ {#t2}

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In a cartoon, the asteroid lands and every dinosaur on Earth burns in one second. What is closer to the truth?

- **1.** The dinosaurs all drowned in the flood it made — score 3
- **2.** Every single dinosaur on the planet really did die within one second — **← Mova's choice** · score 4
- **3.** Most died in the cold, dark years after, when plants stopped growing — **✓ the right answer** · no support
- **4.** Only the dinosaurs in Mexico died — score 4

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 4, tied with another option at 4 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 76, line 16: «After the dinosaurs died out, mammals spread into many new kinds, and within about 10 million years there were early bats, early whales and dog-sized early hor…», reached through the option's own match among the sentences about the question's things. What matched: the same action «die out» (+2); the same doer «dinosaurs» (+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/76-end-of-the-dinosaurs-and-birds/t2/)

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### Test 3 · ★★ · wrong ✗ {#t3}

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«why'd the T. rex die if it ate meat, not plants?» What is the best answer?

- **1.** Plants died without sunlight, then plant-eaters, then meat-eaters — **✓ the right answer** · no support
- **2.** The asteroid hit every T. rex directly — no support
- **3.** Meat-eaters were allergic to dust — no support
- **4.** T. rex secretly ate plants too, so it starved when the plants were gone — **← Mova's choice** · score 7

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 7, the only option with support. Its support: lesson 46, line 1: «Almost every meal on Earth starts with sunlight: green plants and algae catch the Sun's energy and build food from water and carbon dioxide, and every animal l…», reached through the remembered sentence the question matched. What matched: the same thing acted on «plants» (+5); the same action «eat» (+2). The right option, 1, 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/76-end-of-the-dinosaurs-and-birds/t3/)

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### Test 4 · ★★ · wrong ✗ {#t4}

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What would the world probably be like if the asteroid had missed?

- **1.** Exactly the same as today — **← Mova's choice** · no support
- **2.** Big dinosaurs might still rule and mammals might have stayed small — **✓ the right answer** · no support
- **3.** Humans would have appeared 60 million years earlier and tamed the dinosaurs — no support
- **4.** There would be no birds or any reptiles — 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/76-end-of-the-dinosaurs-and-birds/t4/)

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### Test 5 · ★★ · right ✓ {#t5}

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«ostriches hide their heads in the sand when scared» What is right?

- **1.** That's a myth; they lower their heads to turn eggs in the nest hole — **← Mova's choice** · **✓ the right answer** · score 10
- **2.** Yes, so the lions cannot see them — no support
- **3.** No, they hide their heads under their wings until the danger has gone away — score 2
- **4.** Yes, and they can breathe through the sand for hours — score 3

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 10, against 3 for the next best. Its support: lesson 76, line 14: «The ostrich is the biggest living bird, up to about 2.7 metres tall, and runs at around 70 kilometres per hour; it does not bury its head in sand; the myth may…», reached through the remembered sentence the question matched. What matched: the same thing acted on «heads» (+5); its «because» matches the remembered cause (+4); the same action «lower» (+2). Against it: the same doer «ostriches» (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/76-end-of-the-dinosaurs-and-birds/t5/)

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### Test 6 · ★★ · wrong ✗ {#t6}

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«my mate says crocs are just big lizards» What is right?

- **1.** Yes, crocodiles are just giant lizards that live in water — **← Mova's choice** · no support
- **2.** No, crocodiles are a kind of fish — no support
- **3.** Crocodiles are closer relatives of birds than of lizards — **✓ the right answer** · no support
- **4.** No, crocodiles are mammals — 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/76-end-of-the-dinosaurs-and-birds/t6/)

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### Test 7 · ★★ · wrong ✗ {#t7}

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Why is a thin layer found all over the world such good evidence?

- **1.** It shows the layer was painted on later — **← Mova's choice** · score 3
- **2.** It shows one event touched the whole planet at the same time — **✓ the right answer** · no support
- **3.** It proves the asteroid was made of clay — no support
- **4.** It shows each country was hit by its own small asteroid at a different time — no support

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**Why:** It took the question to ask why something happens (its cause). It chose option 1 with score 3, the only option with support. Its support: lesson 74, line 10: «Rock layers are laid one on top of another, so lower layers are usually older; scientists date volcanic ash layers with natural atomic clocks in the rock.», reached through the cause of the sentence the question matched. What matched: the same thing acted on «rock layers» (+5). Against it: a different action (counts against) (-2). 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/76-end-of-the-dinosaurs-and-birds/t7/)

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### Test 8 · ★★ · wrong ✗ {#t8}

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Which animal is the closest living relative of T. rex in this list?

- **1.** A rhino — **← Mova's choice** · no support
- **2.** A lizard — no support
- **3.** A chicken — **✓ the right answer** · no support
- **4.** A shark — 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/76-end-of-the-dinosaurs-and-birds/t8/)

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### Test 9 · ★★ · wrong ✗ {#t9}

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«why would a dino that can't fly have feathers, that's dumb» What is right?

- **1.** Feathers first helped with warmth and display, and later with flying — **✓ the right answer** · score 3
- **2.** Feathers grew only on dinosaur babies — no support
- **3.** Only flying dinosaurs had feathers — no support
- **4.** Feathers are useless without flying, so they must all have flown — **← Mova's choice** · score 6

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**Why:** It took the question to ask why something happens (its cause). It chose option 4 with score 6, against 3 for the next best. Its support: lesson 76, line 13: «Yutyrannus, a relative of T. rex from China about 125 million years old and about 9 metres long, had long fluffy feathers; feathers first evolved for warmth an…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «feathers» (+4); the same action «fly» (+2). The right option, 1, scored 3. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/76-end-of-the-dinosaurs-and-birds/t9/)

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### Test 10 · ★★ · right ✓ {#t10}

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«bloody huge bird, an ostrich, is that even a dinosaur» What is right?

- **1.** Yes, but only the eggs are dinosaurs — no support
- **2.** Yes, like all birds it is a living dinosaur — **← Mova's choice** · **✓ the right answer** · score 6
- **3.** No, ostriches came from camels in the desert — no support
- **4.** No, only the small birds are dinosaurs — score 5

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 6, against 5 for the next best. Its support: lesson 34, line 16: «Harris's hawks hunt in family groups, which is rare for birds of prey, and they are often trained by falconers.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «family groups» (+2); the same light verb (be, have, do, get, go) (+2); the same thing acted on «family groups» (+1); the same circumstance (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/biology/76-end-of-the-dinosaurs-and-birds/t10/)

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### Test 11 · ★★ · wrong ✗ {#t11}

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Why could two disasters together, an asteroid and the volcanoes, be worse than one?

- **1.** Volcanoes cooled down the asteroid crater — **← Mova's choice** · no support
- **2.** The ash from the volcanoes blocked the asteroid, but then made the whole world freeze — no support
- **3.** Two disasters cancel each other out — no support
- **4.** Life already weakened by one had less chance to survive the other — **✓ 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/76-end-of-the-dinosaurs-and-birds/t11/)

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

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Identify the evidence adduced by Luis and Walter Alvarez in the year 1980 in support of an asteroid impact.

- **1.** Trackways of dinosaurs leading away from Mexico — **← Mova's choice** · no support
- **2.** A worldwide stratum of clay enriched in iridium, an element abundant in asteroids — **✓ the right answer** · no support
- **3.** A fragment of the asteroid embedded within a dinosaur skull — no support
- **4.** A layer of ice of worldwide extent containing great quantities of meteoric dust — 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/76-end-of-the-dinosaurs-and-birds/e1/)

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

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Which of the following statements most accurately characterises the evolutionary origin of birds?

- **1.** Birds are descended from the pterosaurs, the flying reptiles of the Mesozoic — **← Mova's choice** · no support
- **2.** Birds are descended from the long-necked sauropods — no support
- **3.** Birds are descended from small feathered carnivorous dinosaurs — **✓ the right answer** · no support
- **4.** Birds arose independently of all reptiles — 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/76-end-of-the-dinosaurs-and-birds/e2/)

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### Exam question 3 · formal language · wrong ✗ {#e3}

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Select the response consistent with the established facts concerning the principal cause of death following the impact.

- **1.** The direct impact of the asteroid upon every living creature — **← Mova's choice** · no support
- **2.** A reversal of the rotation of the Earth — no support
- **3.** The obscuring of sunlight by dust, which cooled the planet and halted plant growth — **✓ the right answer** · no support
- **4.** A worldwide flood which drowned all land animals — 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/76-end-of-the-dinosaurs-and-birds/e3/)

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

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State the anatomical composition of the wishbone, or furcula.

- **1.** A bone of the tail — **← Mova's choice** · no support
- **2.** A single additional rib — no support
- **3.** A portion of the skull — no support
- **4.** Two collarbones fused together — **✓ 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/76-end-of-the-dinosaurs-and-birds/e4/)

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- ← previous: [75. Dinosaurs: kinds, sizes and how they lived](https://md.mova.elamur.ai/free/en/school-run/biology/75-dinosaurs-kinds-sizes-and-lives/)
- next →: [77. Endangered animals and extinction](https://md.mova.elamur.ai/free/en/school-run/biology/77-endangered-animals-and-extinction/)
- ↑ back to [Biology](https://md.mova.elamur.ai/free/en/school-run/biology/)