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[answer correctly for brainliest]
Index fossils are used to determine the relative ages of rock and fossils and are also used to

A) define the boundaries between geologic periods
B) determine the absolute age of surrounding rock
C) identify the fossil species found in rock layers
D) infer evolutionary relationships between organisms

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Answer:

Correct answer is A) to define the boundaries between geologic periods.

Explanation:

To define boundaries an index fossil must be distinctive or easily recognizable, abundant, and have a wide geographic distribution and a short range through time.

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