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svetoff [14.1K]
3 years ago
14

[answer correctly for brainliest]

Biology
1 answer:
Elis [28]3 years ago
5 0

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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