A scientist finds a fossil that she thinks might make a good index fossil. Which characteristic does this fossil most likely

Question

A scientist finds a fossil that she thinks might make a good index fossil.
Which characteristic does this fossil most likely have?
It is the remains of an organism still found alive today.
It is the remains of an organism that is found in abundance nearby.
It is the only fossil for this type of organism that has ever been found.
It is the remains of an organism that lived in a narrow geographic area.

Kunduz · Accepted Answer

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