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Index fossils are found throughout the world and come from organisms which existed during limited periods of geologic time. Which of the following best describes what index fossils can be used to determine?
A.
the age of a layer of rock
B.
when an organism first appeared on Earth
C.
how an organism evolved over time
D.
the way an organism went extinct

Answer :

12697003

Answer: A. the age of a layer of rock

Explanation:

Index fossils are of organisms that lived over a wide area. They lived for a fairly short period of time.

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