Science, asked by killerstain58, 20 hours ago

The geological division of time known as PERIOD is based on which of the following?

A Mass extinction event
B Identifiable but smaller changes in life forms
C More specific grouping based on individuals species
D How many years it last

Answers

Answered by vvabtharanikj00
0

Answer:

option a...

Explanation:

mass extinction event....

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