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Analyzing Fossil Locations

APBIO-2EWK4K

Created for Albert.io. Copyright 2016. All rights reserved.

The image above shows where a team of paleontologists have dug down into the earth through several layers of sedimentary rock labeled A through D.

If $x$ shows where the scientists found fossils of two closely related species of dinosaur, in which layer should they expect to find fossils from their most recent common ancestor?

A

A

B

B

C

C

D

D