Evolution: why giraffes really have long necks
Tests: 2 of 11 right · Exam: 0 of 4 right · Kind: ★★ · Understood: 7 of 15 · Run: 2026-10-18, commit f3c23ea72
Lesson 278 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.
Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: the lesson's questions in the corpora.
Test 1 · ★★ · right ✓
«my teacher said giraffes stretched their necks for leaves and their babies got the long necks. that's how it works yeah?» What is right?
- 1. No, that is Lamarck's old idea; long-necked giraffes left more babies over many generations — ← Mova's choice · ✓ the right answer · score 5
- 2. No, giraffe necks have never changed — no support
- 3. Yes, but only for female giraffes — no support
- 4. Yes, stretching makes the babies' necks longer — no support
Why: It took the question to ask what something is like. It chose option 1 with score 5, the only option with support. Its support: lesson 278, line 15: «Evolution has no plan or goal; it is just which living things leave more babies in their time and place, and the result can look designed but happens step by s…», reached through the option's own match among the sentences about the question's things. What matched: the same action «leave» (+4); a different doer (counts against) (+1). · the question and its options parsed, with trees and pragmatics
Test 2 · ★★ · wrong ✗
Count them: a giraffe and a mouse stand side by side. How many neck bones do they have together?
- 1. 7 — ← Mova's choice · no support
- 2. 14 — ✓ the right answer · no support
- 3. 24 — no support
- 4. 21 — no support
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
Test 3 · ★★ · wrong ✗
«a fish is less evolved than me cos it can't even walk lol» What is right?
- 1. No, fish are more evolved than you because they have been around much longer — no support
- 2. Yes, fish are half-finished people — no support
- 3. No, a fish is fitted to water as well as you are fitted to land — ✓ the right answer · no support
- 4. Yes, fish stopped evolving long ago — ← Mova's choice · score 6
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 73, line 14: «Mexican tetra fish trapped in dark caves evolved to lose their eyes and colour, because eyes are useless in darkness and cost energy; they feel movements with…», reached through the option's own match among the sentences about the question's things. What matched: the same action «evolve» (+3); the same doer «mexican tetra fish» (+3). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics
Test 4 · ★★ · wrong ✗
What would happen over many generations if a river fish species got trapped in a dark cave?
- 1. It would turn into a bat — ← Mova's choice · no support
- 2. It would grow bigger eyes to see in the dark — no support
- 3. Its eyes might slowly get smaller or disappear — ✓ the right answer · no support
- 4. Nothing could ever change — no support
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
Test 5 · ★★ · right ✓
«if giraffes needed long necks so bad, why's the okapi got a short one» What is the best answer?
- 1. The okapi is a baby giraffe — no support
- 2. The okapi's neck was bitten short by lions, and its babies were born that way — score 4
- 3. The okapi forgot to stretch — score 3
- 4. The okapi lives in thick forest, where a short neck fits its way of life — ← Mova's choice · ✓ the right answer · score 7
Why: It took the question to ask why something happens (its cause). It chose option 4 with score 7, against 4 for the next best. Its support: lesson 278, line 10: «The okapi, with a shorter neck and stripy legs, is the giraffe's closest living cousin; it lives in thick forest, where a short neck suits its way of life, and…», reached through the option's own match among the sentences about the question's things. What matched: the same action «live» (+4); the same place «thick forest» (+3). · the question and its options parsed, with trees and pragmatics
Test 6 · ★★ · wrong ✗
In a cartoon, a giraffe ties its long neck in a knot and then untangles it. Why can't a real giraffe?
- 1. Real giraffes have no bones in their necks, but their skin is far too thick — ← Mova's choice · score 8
- 2. Real giraffes can tie two knots, not one — score 3
- 3. Its neck is made of rubber — no support
- 4. Its neck has only 7 long bones and bends like ours, not like rope — ✓ the right answer · score 8
Why: It took the question to ask which statement is true. It chose option 1 with score 8, tied with another option at 8 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 278, line 9: «A giraffe has 7 neck bones, the same number as a mouse and a person; each bone is just very long, up to about 25 centimetres or more.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «giraffe» (+3); the same light verb (be, have, do, get, go) (+3); the same thing acted on «7 neck bones» (+2). The right option, 4, scored 8. · the question and its options parsed, with trees and pragmatics
Test 7 · ★★ · wrong ✗
Count them: Darwin sees 3 giant tortoises and 2 iguanas on an island. How many legs in all?
- 1. 12 — ← Mova's choice · no support
- 2. 20 — ✓ the right answer · no support
- 3. 10 — no support
- 4. 18 — no support
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
Test 8 · ★★ · wrong ✗
«Darwin did it all alone and was first» What is closer to the truth?
- 1. Darwin got it from a TV show — ← Mova's choice · no support
- 2. Nobody had the idea before 1959 — no support
- 3. Darwin copied all of it from Lamarck, who wrote it down years before — no support
- 4. Wallace had the same idea of natural selection at the same time — ✓ the right answer · no support
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
Test 9 · ★★ · wrong ✗
«half an eye is useless so eyes can't evolve» What is right?
- 1. A simple light patch is already useful, and every stage between exists in animals today — ✓ the right answer · score 3
- 2. Right, only people have eyes — no support
- 3. Eyes evolved from teeth — ← Mova's choice · score 6
- 4. Right, eyes came all at once — no support
Why: It took the question to ask which statement is true. It chose option 3 with score 6, against 3 for the next best. Its support: lesson 278, line 17: «The eye could evolve bit by bit: a light-sensing patch is already useful, a cup shape shows direction, a pinhole makes a picture, and a lens makes it sharp; al…», reached through the option's own match among the sentences about the question's things. What matched: the same action «evolve» (+3); the same doer «eye» (+3). The right option, 1, scored 3. · the question and its options parsed, with trees and pragmatics
Test 10 · ★★ · wrong ✗
«evolution's goal is to make humans, we're the top» What is right?
- 1. Yes, and dogs are next — ← Mova's choice · no support
- 2. Evolution aims to make everything fly — no support
- 3. Evolution has no goal; it keeps whatever helps animals leave babies in their place — ✓ the right answer · no support
- 4. Yes, every animal is trying to become human, and apes are just the closest so far — no support
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
Test 11 · ★★ · wrong ✗
«a whale is a big fish, always lived in the sea» What does the evidence show?
- 1. Whales came from sharks — no support
- 2. Whales came from giant squid that lost their arms and grew a tail and flippers — no support
- 3. Whales have no relatives at all — ← Mova's choice · score 6
- 4. Whales come from land mammals like Pakicetus that walked on four legs — ✓ the right answer · no support
Why: It took the question to ask what it is done to. It chose option 3 with score 6, the only option with support. Its support: lesson 8, line 16: «The Challenger Deep in the Mariana Trench is about 11 km deep, with pressure over 1,000 times that at the surface, and Everest put inside it would have its pea…», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+4); the same thing acted on «small fish» (+2). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics
Exam question 1 · formal language · wrong ✗
Identify the principal deficiency of the hypothesis advanced by Lamarck in respect of the neck of the giraffe.
- 1. The necks of giraffes possess no bones — ← Mova's choice · score 5
- 2. Giraffes do not consume foliage of any kind — no support
- 3. Giraffes produce no offspring — no support
- 4. Characteristics acquired during a lifetime are not transmitted through the DNA to offspring — ✓ the right answer · no support
Why: It took the question to ask which statement is true. It chose option 1 with score 5, the only option with support. Its support: lesson 128, line 14: «A giraffe's neck has only seven bones, like almost all mammals, and its heart weighs about 11 kilograms to push blood up to its head.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «neck» (+3); the same thing acted on «seven bones» (+2). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics
Exam question 2 · formal language · wrong ✗
State the number of cervical vertebrae, hereinafter referred to as neck bones, possessed by the giraffe.
- 1. Seventy — ← Mova's choice · no support
- 2. Seven — ✓ the right answer · no support
- 3. Seventeen — no support
- 4. Two — no support
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
Exam question 3 · formal language · wrong ✗
Select the response consistent with the established facts concerning the purpose or goal of evolution.
- 1. Evolution is directed towards flight in all creatures — ← Mova's choice · no support
- 2. Evolution is directed towards ever greater size — no support
- 3. Evolution is directed towards the production of humans — no support
- 4. Evolution possesses no purpose or goal whatsoever — ✓ the right answer · no support
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
Exam question 4 · formal language · wrong ✗
Which of the following statements most accurately characterises the loss of eyes in Mexican cave fish?
- 1. The eyes were removed by predatory creatures — ← Mova's choice · no support
- 2. Eyes, being costly and useless in darkness, diminished over many generations — ✓ the right answer · no support
- 3. The fish were born without eyes in a single generation — no support
- 4. Each individual fish elected to discard its eyes — no support
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
This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/biology/278-evolution-why-giraffes-really-have-long-necks/