Geologic time is divided into units based upon types of a. sedimentary rocks c. organisms b. climatic changes d. igneous rocks select the best answer from the choices provided a b c

It is c organisms geological time into little parts based upon types of organisms.

c. organisms

Geologic time depicts significant events in the history of earth with respect to the organisms which survived and extinct in a particular time period. The geologic time has been divided into eras, periods and epochs. The time since death of the organisms can be identified by their fossils.  

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