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Continental crust began forming during the Hadean.

What is punctuated equilibrium?​

Using pea plants, ___________ demonstrated how genetic variation is maintained and passed on.

What is abiogenesis?

______________ states that organisms have changed throughout Earth’s history.

The Precambrian makes up the largest proportion of geologic time.

The last of the three Cordilleran Orogenies began in the Cretaceous and extended into the Cenozoic. This orogenic event was the:

Oxygen levels in the atmosphere increased throughout the Proterozoic.

Periods are the largest subdivision of geologic time.

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