Question

Geologic time is divided into units based upon types of ___. A-sedimentary rocks. B-climate changes. C-organisms. D-igneous rocks

Answer 1

A.sedimentary rock ,put this way process of elimination cross out the one that does not make sense there for its leaving you with A or D know ask your self can igneous rock divide it self NO can sedimentary rock divide the plates YES so a is the answer

Answer 2

C organisms Hope this helps. :)