MovaA shed skin is a trace, not another living snake
Tests: 1 of 5 right · Exam: 0 of 3 right · Kind: ★★ · Understood: 5 of 8 · Run: 2026-11-05, commit 610eccd1d
Lesson 412 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.
Test 1 · ★★ · wrong ✗
A hiker photographs a shed skin under a rock on Monday. What can the photograph itself support?
- 1. The snake shed its skin at exactly that time on Monday — ← Mova's choice · score 5
- 2. The snake still lives under that rock — score 3
- 3. A discarded covering was under the rock then — ✓ the right answer · no support
- 4. The snake is now a year younger — no support
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 353, line 9: «The outer layer of skin replaces itself about every four weeks, bit by bit, while a snake sheds its whole skin in one go.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «snake» (+3); the same thing acted on «whole skin» (+2). The right option, 3, found no support in what it remembers.
Test 2 · ★★ · right ✓
A shed is found beside a path. Which claim needs additional evidence?
- 1. The finder has seen an object there — no support
- 2. The covering can retain a visible pattern — no support
- 3. The object can be photographed — no support
- 4. The living snake is still beside that path — ← Mova's choice · ✓ the right answer · score 5
Why: It took the question to ask who or what does it. It chose option 4 with score 5, the only option with support. Its support: lesson 246, line 18: «If a snake is on a path, stand still or back away slowly, because snakes bite mostly when trapped or stepped on; if someone is bitten, keep them still and get…», 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) (+4); it fills the role the question asks for (+1); one says «not», the other does not (counts against) (+1). Against it: the same place «path» (-1).
Test 3 · ★★ · wrong ✗
An adult snake sheds and then continues its ordinary life. Which description fits?
- 1. Its earlier history has disappeared — ← Mova's choice · no support
- 2. Its birth date has changed — no support
- 3. A new animal has hatched from the adult — no support
- 4. A new outer layer on the same animal — ✓ the right answer · no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown.
Test 4 · ★★ · wrong ✗
One animal has shed several times. What prevents using an arbitrary shed count as an exact age in years?
- 1. No snake sheds after its first year — ← Mova's choice · score 7
- 2. No fixed shedding rate is established here — ✓ the right answer · no support
- 3. A shed always contains a written date — score 3
- 4. Every shed represents exactly one year — score 3
Why: It took the question to ask who or what does it. It chose option 1 with score 7, against 3 for the next best. Its support: lesson 412, line 7: «A snake does not become younger when it sheds.», reached through the remembered sentence the question matched. What matched: the same action «shed» (+3); it fills the role the question asks for (+3); the same doer «snake» (+1). The right option, 2, found no support in what it remembers.
Test 5 · ★★ · wrong ✗
An old shed was carried to a different garden. What does its new position show?
- 1. The snake has become a different species — ← Mova's choice · no support
- 2. The snake became younger during transport — no support
- 3. The trace can move without its maker — ✓ the right answer · no support
- 4. The original snake must now live there — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown.
Exam question 1 · formal language · wrong ✗
An observer sees an empty snake-shaped covering and concludes that two living snakes exist, one inside each shape. What is wrong?
- 1. A covering was mistaken for an animal — ✓ the right answer · no support
- 2. All snake-shaped objects must be animals — no support
- 3. The observer counted too few colours — ← Mova's choice · score 2
- 4. An empty covering must be a plant — no support
Why: It took the question to ask which statement is true. It chose option 3 with score 2, the only option with support. Its support: lesson 348, line 7: «A pea pod usually holds about five to ten peas, and Gregor Mendel, a monk, counted the colours and shapes of peas on thousands of plants and discovered how fea…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «colours» (+2). The right option, 1, found no support in what it remembers.
Exam question 2 · formal language · wrong ✗
Two dated observations identify the same snake before and after shedding. Which property does shedding leave unchanged?
- 1. Whether a shed layer has been left behind — ← Mova's choice · no support
- 2. The animal's date of birth — ✓ the right answer · no support
- 3. Which outer skin layer it carries — no support
- 4. Where the discarded layer lies — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown.
Exam question 3 · formal language · wrong ✗
A visitor is startled by a coiled shed skin and says the startle proves it is alive. Which reply fits the lesson?
- 1. Fear and shape do not show that it is alive — ✓ the right answer · no support
- 2. Shed skins become alive when they are found — ← Mova's choice · score 4
- 3. A strong fear always detects living animals — no support
- 4. A coiled outline proves muscles are inside — no support
Why: It took the question to ask who or what does it. It chose option 2 with score 4, the only option with support. Its support: lesson 412, line 6: «An empty discarded skin is not a second living snake.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+3); the same doer «empty discarded skin» (+1). The right option, 1, found no support in what it remembers.
This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/biology/412-shed-skin-living-snakes-and-limits-of-inference/