If a fossil dissolves away, it can leave behind a cavity in the rock called a ____.

Eras of the geologic time scale are divided into _________.

Reptiles were dominant during which era?

What is the name of the first period of geologic history?

What period of time are we presently living in?

What epoch do we currently live in?

Birds first appeared during which of the following eras?

The earliest and longest span of Earth's history is ______.

Period on the geologic time scale are subdivided into ______.

Which of the following would be classified as a trace fossil?

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