-The diagram shows an outcrop of sedimentary rock whose strata are labeled A-D.If x indicates the location of fossils of two closely related species,then fossils of their most-recent common ancestor are most likely to occur in which stratum?
A)A
B)B
C)C

Question

-The diagram shows an outcrop of sedimentary rock whose strata are labeled A-D.If x indicates the location of fossils of two closely related species,then fossils of their most-recent common ancestor are most likely to occur in which stratum?
A)A 
B)B 
C)C

Quizplus · Accepted Answer

According to the principle of faunal succession, the most recent common ancestor of two species would be found in strata that are older than those containing the species themselves but not older than necessary. Since species are found in strata A and B, their common ancestor would most likely be in the next oldest stratum, which is C.

-The Diagram Shows an Outcrop of Sedimentary Rock Whose Strata