Lesson 16 ·Class 9 · Five Kingdom Classification · Sort Lab
The Five Vertebrate Classes
Skin, breathing, eggs and blood.
Sort each feature into the vertebrate class it belongs to.
Sorted 0/11
All items sorted — check each bin.
Free play — sort every item into the bin it belongs in; each correct drop tells you why. Switch to when you're ready to test yourself.
Read the classes as a march away from water: gills → both → dry scales and shelled eggs → feathers → hair and milk.
What this lesson covers
What you do
- Track the heart as you go: 2 chambers, then 3, then incompletely 4, then fully 4 twice over.
Challenges to clear
- Fill the Amphibia bin correctly.
- Now fill the Mammalia bin.
- Sort every feature.
- Fill the Pisces box — the only class that breathes with gills all its life.
The task
Sort each feature into the vertebrate class it belongs to.
What this lesson covers
- Pisces — Fishes: Body covered with scales; breathes through gills all its life (Fully aquatic from hatching to death.); Swims using fins; has a two-chambered heart (Single circulation — blood passes through the heart once per circuit.)
- Amphibia — Frogs, toads: Moist glandular skin without scales; can breathe through it (Which is why an amphibian must stay damp.); Larva breathes by gills in water; adult breathes by lungs on land (Amphi = both, bios = life. It must return to water to breed.)
- Reptilia — Snakes, lizards: Dry horny scales; skin without glands (Waterproofing that finally freed vertebrates from damp habitats.); Lays shelled eggs on land; heart incompletely four-chambered (The shelled egg is the other half of that escape from water.)
- Aves — Birds: Body covered with feathers; forelimbs modified into wings (Feathers are unique to birds.); Hollow bones, a beak without teeth, and a four-chambered heart (Every feature reduces weight for flight.)
- Mammalia — Mammals: Body covered with hair; skin has sweat and oil glands (Hair and skin glands together are found in no other class.); Females have mammary glands and feed the young on milk (This is what the class is named for.); Warm-blooded, with a fully four-chambered heart, and mostly gives birth to live young (Only birds and mammals are warm-blooded, and they evolved it separately.)
Hint
Read the classes as a march away from water: gills → both → dry scales and shelled eggs → feathers → hair and milk.