Timeline of Earth's History

Which organism appeared first?

• Development of Fish
• Appearance of Humans
• First single-celled organisms (Cyanobacteria)
• Appearance of Jellyfish and Corals

During which era/eon did the dinosaurs live and die?

• Paleozoic
• Pre-Cambrian
• Mesozoic
• Cenozoic

During which era/eon did life on land first evolve?

• Paleozoic
• Pre-Cambrian
• Mesozoic
• Cenozoic

During which era/eon do humans live in?

• Cenozoic
• Pre-Cambrian
• Paleozoic
• Mesozoic

During which era did the mammoth live?

• Precambrian 
• Paleozoic
• Mesozoic
• Cenozoic

What does the term paleozoic mean?

• old life (ancient life)
• rock strata 
• Ancient rock 
• Fossils

How old do Paleontologists believe the Earth is?

• 2015 years old
• 3.6 billion years old
• 4.6 billion years old
• 4.6 million years old

Where did most of the life live during the paleozoic era?

• Land
• Water
• Air
• None. There was no life in the paleozoic era.

The time scale of Earth History is called the:

• Earth Time Scale
• Geologic Time Scale
• Earth History Time Scale
• Radiometric Time Scale

The disappearance of a species.

• Evolution
• Extinction
• Migration
• Mutation