Bones by name: the skull, jaw, spine and ribs

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

Lesson 357 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 · ★ · wrong ✗

«my uncle says men have one less rib cos of an old story, true?» What is right?

1. Yes, men have 23 ribs — ← Mova's choice · score 2
2. No, women have one less — no support
3. No, men and women both have 24 ribs — ✓ the right answer · score 2
4. Yes, but only some men — no support

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 357, line 13: «People have 12 pairs of ribs, 24 in all, and men and women have the same number; the idea that men have one rib fewer is a myth.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «one rib» (+1); the same light verb (be, have, do, get, go) (+1). The right option, 3, scored 2. · the question and its options parsed, with trees and pragmatics

Test 2 · ★ · right ✓

Count them: a skull has 22 bones. A museum shows three human skulls. How many skull bones in all?

1. 66 — ← Mova's choice · ✓ the right answer · no support
2. 25 — no support
3. 22 — no support
4. 44 — 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 · ★ · right ✓

Count them: a person has 12 pairs of ribs and a mouse has 13 pairs. How many ribs does the person have?

1. 24 — ← Mova's choice · ✓ the right answer · no support
2. 26 — no support
3. 12 — no support
4. 13 — 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 4 · ★ · right ✓

In a Tom and Jerry cartoon Tom stretches his neck long like a giraffe's, then snaps it back short. What is true about real necks?

1. A giraffe and a person both have seven neck bones; a giraffe's are just much longer — ← Mova's choice · ✓ the right answer · score 3
2. A giraffe's neck has hundreds of tiny bones — no support
3. A person's neck has no bones at all — score 3
4. Necks can stretch like rubber — score 2

Why: It took the question to ask which statement is true. It chose option 1 with score 3, tied with another option at 3 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 278, line 5: «It also changes what is already there instead of starting fresh, so a giraffe has the same seven neck bones as you and a mouse, only much longer.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «same seven neck bones» (+1); the same property (+1); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics

Test 5 · ★ · wrong ✗

What animal has a very short neck but still has seven neck bones?

1. A bird — ← Mova's choice · no support
2. A fish — no support
3. A snake — no support
4. A mouse — ✓ 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 6 · ★ · wrong ✗

«I can wiggle my whole skull, look» What is really moving?

1. The nose bone — ← Mova's choice · score 6
2. The top of the skull — no support
3. Only the lower jaw; the other skull bones are joined tight — ✓ the right answer · no support
4. All 22 skull bones, sliding about on their zigzag seams — no support

Why: It took the question to ask what it is done to. It chose option 1 with score 6, the only option with support. Its support: lesson 357, line 1: «The skull looks like one big bone, but it is 22 bones fitted together with zigzag seams called sutures, as tight as the pieces of a hard jigsaw.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+4); the same thing acted on «22 bones» (+2). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 7 · ★ · right ✓

What would happen if a baby's skull bones were joined tight at birth?

1. The baby's teeth would come through earlier — no support
2. The baby would be much cleverer — no support
3. Nothing would change — no support
4. The head could not squeeze through so easily and the brain would have no room to grow — ← Mova's choice · ✓ the right answer · score 7

Why: It took the question to ask what happens next. It chose option 4 with score 7, the only option with support. Its support: lesson 155, line 5: «The boto, or Amazon river dolphin, can turn its head because its neck bones are not joined, and older botos are often the pinkest because scraped skin heals wi…», reached through what followed the sentence the question matched. What matched: the same action «turn» (+6); a different doer (counts against) (+1). · the question and its options parsed, with trees and pragmatics

Test 8 · ★ · right ✓

«fell on me bum, now it hurts to sit, but there's no bone there right» What is right?

1. Only the hip bones are there — no support
2. Right, there is no bone there at all, only soft fat — no support
3. It is a muscle, not a bone, that hurts — score 2
4. The tailbone is there, and muscles attach to it — ← Mova's choice · ✓ the right answer · score 7

Why: It took the question to ask which statement is true. It chose option 4 with score 7, against 2 for the next best. Its support: lesson 357, line 12: «The tailbone, or coccyx, is a few tiny vertebrae fused together, a leftover of the tails of our ancestors; muscles still attach to it, so a fall on it hurts.», reached through a sentence linked to the one the question matched. What matched: the same action «attach» (+3); the same doer «muscles» (+2); the same receiver «tailbone» (+2). · the question and its options parsed, with trees and pragmatics

Test 9 · ★ · right ✓

In a cartoon a dog swallows a bone and his neck moves; a boy feels his own throat move when he swallows. What bone helps him swallow?

1. A neck vertebra — no support
2. The lower jaw — score 2
3. The hyoid, a small horseshoe bone held by muscles — ← Mova's choice · ✓ the right answer · score 6
4. A rib — no support

Why: It took the question to ask who or what does it. It chose option 3 with score 6, against 2 for the next best. Its support: lesson 318, line 17: «Reindeer are the only deer in which both males and females grow antlers; males drop theirs in early winter, while females keep theirs through the winter.», reached through the same lesson line as the sentence the question matched. What matched: the same action «keep» (+3); the same thing acted on «antlers» (+3). · the question and its options parsed, with trees and pragmatics

Test 10 · ★ · wrong ✗

Why might a completely straight spine be worse than an S-shaped one?

1. It could not spring and cushion your steps so well — ✓ the right answer · no support
2. It would stop the ribs moving — no support
3. It would make you much taller, so you would bump your head — ← Mova's choice · score 1
4. It would protect the lungs less — no support

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 1, the only option with support. Its support: lesson 162, line 7: «The titan arum makes one of the biggest flower structures in the world, up to about three metres tall, and it stinks of rotting meat or fish to attract insects.», reached through the option's own match among the sentences about the question's things. What matched: the same action «make» (+2); the same property (+1). Against it: a different doer (counts against) (-2). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 11 · ★ · right ✓

Why do floating ribs help you bend sideways and breathe?

1. They are made of rubber — no support
2. They are joined to the hips — score 6
3. They are not joined in front, so the lower chest can move — ← Mova's choice · ✓ the right answer · score 12
4. They float loose inside the lungs — no support

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 12, against 6 for the next best. Its support: lesson 357, line 14: «Ribs protect the heart and lungs, and the lowest two pairs are floating ribs, not joined at the front, which leaves room to breathe and bend.», reached through the same lesson line as the sentence the question matched. What matched: the same action «join» (+5); the same thing acted on «ribs» (+4); the same place «front» (+3). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

State the number of bones of which the human skull is composed.

1. Eight — ← Mova's choice · no support
2. Twenty-two — ✓ the right answer · no support
3. Thirty-three — no support
4. One — 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 2 · formal language · wrong ✗

Identify the sole bone of the skull which is capable of movement.

1. The cheekbone — ← Mova's choice · no support
2. The frontal bone of the forehead — no support
3. The bone of the nose — no support
4. The mandible, or lower jaw — ✓ 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 3 · formal language · wrong ✗

Select the response consistent with the established facts concerning the number of ribs in men and in women.

1. Women possess one pair fewer than men — score 1
2. Men possess one rib fewer than women — score 1
3. Men and women alike possess twelve pairs — ✓ the right answer · score 1
4. The number varies with the stature of the person — ← Mova's choice · score 2

Why: It took the question to ask which statement is true. It chose option 4 with score 2, against 1 for the next best. Its support: lesson 346, line 10: «Most oranges have about ten segments, each packed with tiny juice bags that grew from hairs inside the flower, but the number changes from orange to orange.», reached through the option's own match among the sentences about the question's things. What matched: the same action «change» (+2). The right option, 3, scored 1. · 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 cervical vertebrae of the giraffe?

1. They are absent, the neck being supported by muscle alone — score 6
2. They number in excess of seventy — ← Mova's choice · score 9
3. They are fused into a single bone — score 6
4. They number seven, as in man, each being greatly elongated — ✓ the right answer · score 7

Why: It took the question to ask who or what does it. It chose option 2 with score 9, against 7 for the next best. Its support: lesson 357, line 2: «Only one skull bone moves: the lower jaw, which swings on a hinge just in front of each ear; put your fingers there and open your mouth to feel it.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+4); the same doer «one skull bone» (+2); a different action (counts against) (+2); the same thing acted on «bone» (+1). The right option, 4, scored 7. · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/biology/357-bones-by-name-the-skull-jaw-spine-and-ribs/