Humans are found in what time period?

Which is larger: era or period?

What period is known as age of fish?

Which exist first: insects or sharks

The oldest time period is called ______.

How many mass extinctions occur?

Pangea froms during this period.

Which is era means age of ancient life?

Which is not an example of a type of fossil?

Dinosaurs become extinct at the end of _____ period.

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