Chapter 2: What Makes an Animal an Animal?

Scientists believe the first animals on Earth lived ____________

• on land

• in the sea

• on a mountain

How many cells did the first living things have?

• one

• five

• one hundred

• three

Dakosaurus was an early sea animal that is related to the ___________

• elephant

• crocodile

• alligator

• fish

Dinocephalosaurus was an early sea creature that used its long ________ to capture food.

• ears

• legs

• neck

• fingers

Over time, many dinosaurs began to _______ to life on land.

• crawl

• move

• form

• adapt

The first ________ animals were part reptile and part bird.

• flying

• swimming

• walking

• slithering

Dinosaurs lived during the ___________ period, which lasted about 150 million years.​

• underwater
• Mesozoic

• dinosaur

Earth has more than one million different types of animals.

• false

• true

The largest known sea mammal today is the _______________

• great white shark

• Megalodon

• blue whale

All sea and water animals are fish

• true

• false