What does it mean to CLASSIFY things?
It means to PUT them in GROUPS (group them based on similarities).
What are the two main groups of animals? What's the difference between them?
VERTEBRATES (with backbones) and INVERTEBRATES (without).
Name FOUR animal CLASSES.
Mammals, birds, reptiles, amphibians, insects, fish, arthropods, crustaceans, arachnids, mollusks, etc.
What CLASS of animal is an octopus?
It's a MOLLUSK. (invertebrate)
Arthropods have a skeleton OUTSIDE their body. What's it called?
It's called an EXOSKELETON.
About what PERCENTAGE (%) of animals are VERTEBRATES?
About 3%!
Name TWO TRAITS of mammals.
They have hair/fur, give birth to live young (don't lay eggs), feed their babies milk, breathe with lungs, are warm-blooded, etc.
Name TWO TRAITS of birds.
They have wings, feathers, beaks, make nests, lay eggs, are warm-blooded, have two legs, etc.
Name TWO TRAITS of fish.
They have fins and gills, they live and breathe underwater with gills, lay eggs, are cold-blooded, etc.
What kind of animal is this? CLASSIFY it.
It's a GIANT/COLOSSAL SQUID. It's a MOLLUSK.
