_______________ is the long span of time that begins geologic time.

A unit of geologic time that subdivides eras

The Triassic Period, the Jurassic Period, and the Cretaceous Period occurred in what era?

Scientists divided the time between Precambrian Time and the present into three units of time, or eras.

What period is where humans first appeared?

In which time period are we currently living?

. Jellyfish are one of the oldest species on Earth. In what time period did they first appear?

In what time period did Pangaea, the super continent, appear?

Dinosaurs, small mammals, and birds are found in this time period.

What are fossils that are abundant, easily recognizable, short lived, and widespread called?

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