Question

what is being used by scientists to organize earths history? (1 point)
geologic time scale
layers of rock
mass extinctions
fossil record

Explanation:

The geologic time scale is a system of chronological dating that relates geological strata to time, used by scientists to organize Earth's history. Layers of rock, mass extinctions, and the fossil record are important components in understanding Earth's history but are not the over - arching system for organization.

Answer:

geologic time scale