The diagram shows a chicken embryo and a human
embryo.

which is best supported by the diagram

a. because their embryos have tails, chickens and
humans do not likely share a common ancestor with
fish

b. because their embryos have structures similar to
gills, chickens and humans likely share a common
ancestor with fish.

c. chickens and humans have homologous structures
as embryos, so they are not likely related to each
other.

d. chickens and humans have homologous structures
as embryos, so they are not likely related to any other
organisms.

The correct option is B) Because their embryos have structures similar to

gills, chickens and humans likely share a common  ancestor with fish.

Explanation:

Evolutionary studies show common traits which are present among organisms of different species. Based on these traits, we can tell that which species might have shared common ancestors in the past.

In the structure shown above, we can see that the embryo of a human and a chicken have a structure  similar to the gills of fishes. This shows that these organisms might have shared a common ancestor in the past.