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29-01-2021
Biology

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Why are the best index fossils from species that only existed for a short period of time ?

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beautifulcharm beautifulcharm

29-01-2021

Answer:

Because once they were very common they disappeared after the mass extinction event. ... Many geologic periods were defined by events that made natural boundary to the period.

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29-01-2021

Answer: Because once they were very common they disappeared after the mass extinction event.

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