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Periods are the largest subdivision of geologic time.

A period of time missing from the geologic record is called a(n):

The first major transgression onto the North American continent is represented by the Kaskaskia Sequence.

If a small population of a species becomes separated from its parent population and evolves into a new species, that is called:

Most traits or features of living things are controlled by:

A marine transgression is a period of lower sea level.​

Microevolution results from the cumulative effects of macroevolution.​

Any animal that eats other animals, living or dead, as a source of nutrients is a(n) ____.​

What is the possible cause of the end-Ordovician mass extinction?

To be called “life”, what two processes must be occurring?