Biology, 27.01.2020 23:31, Slaybre8952

What is an important characteristic of an index fossil?

a. it must have been very small.
b. it must not be extinct.
c. it must have lived in a very wide geographic region.
d. it must have lived for a long geologic period of time.

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What is an important characteristic of an index fossil?

a. it must have been very small...