Eras of Earth's History

Near the end of the Paleozoic Era, single-celled organisms were joined by more complex living things.

• True
• False

An invertebrate is an animal with a backbone.

• True
• False

During the Salurian Period, plants and animals became abundant on Earth's land.

• True
• False

A reptile is an animal hat lives part of its life on land and part of its life in water. 

• True
• False

Reptiles are invertebrates that evolved from amphibians.

• True
• False

Between 299 and 250 million years ago, Earth's continents formed a vast landmass called Pangaea. 

• True
• False

A(n) __________________occurs when many types of living things die out at the same time. 

• mass extinction
• mass exhibit

The Mesozoic Era is often called the Age of _____________ because of the success of these animals.

• Reptiles
• Mammals

The Triassic Period saw the rise of __________, or warm-blooded vertebrates that feed milk to their young.

• Mammals
• Reptiles

The geologic period in which we are living is called the 

• Neogene Period
• Quaternary Period