Lesson 6 : Eras of Earth's History

Reptile

-A vertebrate whose body Temp is determined but the Temp of its environment -Has lungs and scaly skin -lays eggs on land

Amphibian

-A vertebrate whose body Temp is determined but the Temp of its environment -Lives its early life in water and adult life on land

Mammal

-A vertebrate whose body Temp is regulated by its internal heat. -Has skin, and hair or fur, and produces milk

The Devonian period is also known as what and why?

-Age of Fished -Every main group of fishes were present at that time

What is another name for the Mesozoic era? What types of animals were abundant during this time?

-Age of the Reptiles -Reptiles

What was Pangaea?

All of the continents combined together to make a super continent

Vertebrate

An Animal with a backbone

Invertebrate

An animal without a backbone

During what period did life really begin to leap forward and develop?

Cambrian Period

How did Earth form?

Scientists think that Earth began as a ball of dust, rock, and ice in space. Gravity pulled this mass together.

What were the only living things through most of earths history?

Single Celled Organisms

What changed in the Quaternary period?

The weather cooled and warmed causing Ice Ages

Why was the extinction of the dinosaurs beneficial for mammals?

They had to compete for housing and food

When did mammals first appear?

Triassic Period

Describe the Paleogene and Neogene periods.

Weather got warmer and mild; cooled over time

Mass Extinction

When many types of living things become extinct at the same time

When was the second mass extinction? What do scientists think happened?

-Cretaceous Period -Asteroid

What happened at the end of the Permian period? What do scientists think happened?

-Mass Extinction -Scientist believe that an asteroid struck Earth

During what period did plants become abundant?

-Silurian Period

What period did animals begin to reach land?

Devonian Period

What period were dinosaurs common?

Jurassic Period