What is a vertebrate?
An animal with a segmented backbone.
Name four classes of vertebrates.
Mammals, reptiles, amphibians, fish, birds, etc.
What are invertebrates?
Animals without backbones (segmented or otherwise).
Name four classes of invertebrates.
Mollusks, echinoderms, cnidarians, worms, arthropods, sponges, etc.
What characteristics identify an arthropod?
Exoskeletons, jointed legs, segmented bodies (with specialized sections).
What are exoskeletons? Tell us an interesting fact about them.
Exterior (outside) skeletons; doesn't grow with the animal, must be shed and replaced as the animal grows.
“All spiders are arachnids, but not all arachnids are spiders.” Explain this statement.
There are other kinds of arachnids beyond spiders.
What is cartilage?
Soft, bonelike material that grows with the animal.
What are animals that walk on two legs called? On four?
Bipeds; tetrapods.
Which is the largest group of invertebrates? Give an example of one.
Arthropods; ants, shrimp, butterflies, etc.
