Animals Through Time

How do scientists know that there used to be an ocean in the middle of the United States?

• They found seaweed growing in Illinois.

• They found fossils of ocean animals underground.

• The soil is salty in Illinois.

• They read a book that said so.

Fossil trees at the bottom of the Gulf of Mexico tell us that the habitat there was once...

• forest

• grassland

• ocean

• desert

What did dinosaurs eat? How do scientists know?

• Only eat because their teeth are sharp.

• Only leaves because their teeth are flat.

• Some eat meat, some eat plants, some eat both. Scientists knows this by looking at the fossils of dinosaur teeth.

How do we know that dinosaurs looked like big reptiles on the outside?

• By their feathers.

• Dinosaurs and reptile skulls, eggs, and skin are similar.

• We don't.

How do scientists know that the footprints they found came from dinosaurs?

• They looked like bird feet.

• The footprints were next to dinosaur fossils.

• They don't know.

How can you tell if someone was walking or running just by looking at their footprints?

• Walking footprints are close together while running footprints are farther apart.

• They say is next to the footprints.

• All footprints are the same distance apart.

Why are there so many different kinds of dogs?

• People have bred different dogs over time.

• There just are.

• We named them different names.