sc15.1 classifying animals

Which set of animals contain only mammals?

• centipede, earthworm, snake
• cat, bat, deer
• turtle, seagull, frog
• butterfly, bird, bat

You can identify a mammal by looking at its

• sand
• hair
• water
• air

Animals that began their life in water, but live most of it on land are

• mammals
• amphibians
• reptiles
• birds

What are gills?

• structures that fish use to take in oxygen
• structures that fish use to swim
• structures that birds use to take in oxygen
• structures that birds use to fly

Most of the animals on Earth are

• vertebrates
• invertebrates
• arthropods
• mollusks

A vertebrate is an animal...

• with a spine or backbone

• without a spine or backbone

Birds, fish, snakes, and turtles are invertebrates.

• True

• False

Insects, spiders, and worms are vertebrates.

• True

• False