Classifying Animals

Which is a way scientists classify animals into groups?

• by how much they weigh

• by their body coverings

• by whether they are cold-blooded or warm-blooded

• by whether they are vertebrates or invertebrates

Which is the largest group of living things?

• birds

• mammals

• fish

• insects

Which animals are cold-blooded?

• fish

• mammal

• reptile

• amphibian

How are animals that have backbones classified?

• cold-blooded

• invertebrates

• warm-blooded

• vertebrates

Which animals are warm-blooded?

• cat

• crocodile

• human

• cow

Which is a vertebrate?

• fish

• ostrich

• lobster

• lizard

Which animal does not belong?

• snake

• crab

• earthworm

• jellyfish

Vertebrate animals are divided into mammals, reptiles, birds, amphibians, and fish. Vertebrate animals are divided into these group based on __________.

• what kinds of foods the animals eat.

• the color of the animals and how they breathe.

• the body structures of the animals.

• whether they are warm-blooded or cold-blooded

How do some cold-blooded animals keep their body temperatures constant when their surroundings are cold?

• basking on a rock in the sun

• going into the shade

• burrowing in the mud

• migrating

Insects, spiders, crustaceans, and mollusks have tough coatings on the outside of their bodies called ________.

• mantles

• mollusks

• spinal cords

• exoskeletons