Question

Scientists think that two species with homologous structures probably had a common________. A.environment B.offspring C.fossil D.ancester

Answer 1

D) ancestor     
for example, apes and humans have some genes and genomes that are the same. we are believed to have come from a common ancestor because of not only that, but the structures of our bones are very similar to one another's. 

Answer 2

the answer is D. ancester