Pls help! Will mark brainliest!

To be considered they must have lived over a very short period of time and had to be many of them.

A) An index fossil
B) A trace fossil
C) A petrified fossil
D) A carbon fossil

A) Index Fossils

Explanation:

Index fossils are fossils used to define and identify geologic periods. Index fossils must have a short vertical range, wide geographic distribution and rapid evolutionary trends.

a. a clone will be physically identical to the original, but won’t be genetically identical

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atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of carbon is as shown here in the image.