Skill: write-like-james @ d1a2a04 · the build: write-lesson, write-mcqs, write-video-script @ d1a2a04; non-author review and one cold read done

Topic 35 "The five vertebrate groups" — your read (29 September 2026)

The Life strand's fourth topic. Six lessons, one atom each: what makes an animal a mammal, a bird, a reptile, an amphibian, a fish — and then the sort. Every lesson opens on a child's wrong guess about a surprising member (a whale is "a big fish"; a penguin "can't be a bird" because it cannot fly; a snake is "slimy"; tadpoles swim like fish and then hop; a seahorse is "a tiny horse"), finds the group's features, coins the word, runs the frame on a near miss (the shark in the same sea; the seal on the same shore; the eel; the minnow; the dolphin), and states the rule last. The sort places a mystery card — fur, milk, swims all day — by its features, not its river. A non-author review (35 findings, all applied or put to you below) and a cold read of the 37 changed items (37 of 37 keys agreed) are done.

The three that unblock the bank

1. Are these the five sentences the course holds to?

"A mammal has hair or fur, and a mammal mother feeds her babies milk."

"A bird has feathers and a beak, and it lays eggs."

"A reptile has dry, scaly skin, and it lays its eggs on land."

"An amphibian has smooth, moist skin. It starts its life in water, then lives on land."

"A fish takes in air from the water with its gills, and it swims with fins."

Each uses only the register's features; every animal the topic names passes its sentence. The reviewer struck "lives in water" from the fish's sentence — the sort's own rule says where an animal lives never sorts it — and it is gone.

Recommendation: yes, as written. One small choice inside it: the bird card judges on two questions (feathers, a beak) while the sentence has three parts (eggs). Say if you want "Lays eggs?" as a third column on the card.

Yes / change one (say which) / add the eggs column

2. Keep "lays its eggs on land" in the reptile sentence?

A few snakes and lizards bear live young, so the topic and its bank name only egg-laying reptiles (a corn snake, a king snake, a python, a sea turtle, a crocodile…) and never a rattlesnake, a boa or a skink. The reviewer's fact: the egg clause sorts nothing that "dry, scaly skin" does not already sort — birds lay eggs on land too, and fish and amphibians are out by their skin. So it costs the live-bearers and buys only the register's wording.

Recommendation: keep it whole — clarity beats accuracy at eight, and no named animal breaks it. If one clause ever goes, this is the one; "smooth, moist skin" stays either way (no toad is named).

Keep / drop the egg clause

3. Do the eight question types stand, with the two typed hard types?

Your night ruling is applied: hard is typed — the group's name from features alone (feathers, a beak, eggs in a nest in the tall grass → "bird"), and the group against a setting that pulls the other way (a sea animal with flippers that comes up to breathe, has a little hair and drank milk → "mammal"). Easy and medium are four-option MCQs and are the bulk. Two types from the first draft were one move and are merged, so two slots are free under your ceiling of ten; the reviewer would give one to the reptile atom, whose only alone-type asks which of four named animals is a reptile. The "which of these tells you" items now use the form you praised in Topic 1: every fact in the stem, the ask is which one sorts.

Recommendation: approve the eight; fill a free slot only if you want a second reptile type. The type sheet

Approve all / strike these / edit these / add a reptile type

The lessons

4. L01 What makes an animal a mammal — Fabiola on a boat calls the whale "a big fish". Close up, the whale has a little hair around its mouth, and the whale mother feeds her baby milk: an animal with hair or fur, whose mother feeds her babies milk, is called a mammal. The shark in the same sea has no hair and no milk — not a mammal. The bat has fur and feeds its babies milk — a mammal; the owl flying at night too has feathers, not fur — not a mammal. The dog with her puppies last. Twelve quiz items on fresh animals (an elephant, a tuna, a sea lion, a moose, you), the attached question a cat.

5. L02 What makes an animal a bird — Bertram at the zoo: "Birds fly. Penguins can't. So a penguin can't be a bird." The penguin has feathers, short and tight, a beak, and an egg — an emperor penguin keeps it warm on its feet. A bird. The seal on the same shore has fur and no beak. The ostrich cannot fly either — a bird. The bat flies, but fur and no beak: flying does not make a bird, feathers do. The robin last. The claim item is a TRUE one: a kiwi is a bird even though it cannot fly.

6. L03 What makes an animal a reptile — Ophelia pulls back from the keeper's snake: "It's slimy!" She touches it. It is dry, and covered in tiny hard scales, and it lays its eggs on land: a reptile. The eel, long and legless too, has slimy skin and lays its eggs in the water — not a reptile, a fish. The sea turtle swims all day, but its skin is scaly and never slimy and it comes up the beach at night to lay its eggs in the sand — a reptile. The salmon in the same sea — a fish. The lizard last.

7. L04 What makes an animal an amphibian — Evander's jar of tadpoles swim like fish; weeks later they have legs and sit on a stone. A frog's skin is smooth and moist (moist means a little wet), and its life began in the pond: eggs, a tadpole, then the bank. Water first, then land: an amphibian. The minnow in the same pond has wet skin too — but it never leaves the water, so the second question decides. The salamander swam in a pond first; the lizard, four legs and a tail like the salamander, has dry scaly skin and never lived in water. The newt last. A tadpole is already a young amphibian (a claim keyed yes).

8. L05 What makes an animal a fish — Gwendolen's seahorse is "a tiny horse". A fish takes in air from the water: under the flap on each side of its head are red combs, and those combs are called gills; the thin flaps it swims with are called fins (a goldfish's, spread wide, on screen at the line). The seahorse has gills and a small fin on its back — a fish. The dolphin in the same sea has no gills: it comes up to breathe air, it was born with a few hairs on its snout, and its mother fed it milk — a mammal. The shark: gills and fins. The penguin: no gills, wings not fins. The goldfish last. The catfish item tests "no scales, still a fish".

9. L06 Place a backboned animal in its group — Jonquil's mystery card: fur, milk from its mother, all day swimming in the river. "A fish!" says someone. Look at the features, not the river: fur and milk are a mammal's features, so the mystery animal is a mammal — a river otter. The five rules in one table (the group key), then a kangaroo, a toucan, a chameleon, a poison dart frog and a swordfish each fit one row. The rule: look at its features, not where it lives or how it moves; its features fit one group. The key sits on the first two quiz items only; two sorts are typed.

Applied without asking

Hard bank items typed; every attached question stands alone with its own drawing (a cat, a duck, a gecko, a tree frog, a trout, a gorilla; the summary's koala, swan and mackerel); no option bundles a verdict with a reason and every claim is bare yes / no (three keyed yes, four no); every stem a positive question; surprising members first in every class; each sorting sentence names only what every member has; the intro (a river at dusk with a bat, a trout, a frog, a heron and a snake) ends on a ready line and a poll and names no group; scene changes spoken with "let's"; three summary questions; scripts at most 150 words; colour, a photo for every real animal, people never drawn as glyphs; "vertebrate" recalled from Topic 34 by a check, never re-coined; "gills" and "fins" coined explain-then-label; the type sheet before the bank with a design-move inventory and fresh exemplars; a headache child never in an item, each claim-maker once; only egg-laying reptiles named anywhere; US spelling.

Also on the site

The six lessons · topic intro and poll · summary and three questions · mixed practice · the blueprint's decisions · the type sheet

After you answer

1 → nothing changes unless you choose the eggs column (one figure family redrawn). 2 → keep: nothing; drop: the reptile sentence, its cards, the key row and four items lose the clause. 3 → a bank of about fifty from the approved types, a second cold read, the hand-over folder for David. Register notes (the egg-layers rule, the fish sentence, the emperor penguin) → the knowledge-graph repo.