Biology, 02.03.2021 01:00 krystalsanabria83

Scientists are excavating in a rock layer of unknown age and they come across an index fossil. What does this tell them about the rock layer?
1
A)the approximate age of the rock layer
B)the exact age of the rock layer
C)that there was a mass extinction at the time the rock layer was deposited
D)how many fossils they should expect to find elsewhere in the area

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