In class, Malik and Deniz were learning about evolution. They studied the two diagrams below.
Diagram A shows four animals as embryos: a fish, an amphibian, a bird, and a human. Diagram
B shows these animals as adults.
Malik and Deniz noticed that all four organisms have gill slits in their embryonic stage and made
the following statements:
Malik said, "I think all four organisms have a common ancestor because they all share a
common characteristic, gill slits, in the embryonic stage."

Deniz said, "I don't think they all descended from a common ancestor, because when they
are adults, they do not all have gills or share many other similar physical characteristics.
1. Who do you agree with? Include information about the evolution in your response.