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Nitella [24]
3 years ago
5

2 Points

Biology
1 answer:
SVEN [57.7K]3 years ago
3 0

Answer:

B, A fossil found in rocks from one time period

Explanation:

Fossils are used to determine the ages of rock layers. Index fossils are the most useful for this. Index fossils are of organisms that lived over a wide area. They lived for a fairly short period of time. An index fossil allows a scientist to determine the age of the rock it is in. Hope that this helps you :)

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