Read the paragraph and then complete the statement that relates common ancestry to homologies. As animals moved on land, they developed four limbs. In animals that moved away from water, such as reptiles , birds, and mammals. a membrane called the amnion protects the embryo in the egg from drying out. The development of four limbs is an example of a(n) square homology , whereas the presence of the amnion is an example of a(n)

The development of four limbs is an example of a(n) **structural** homology, whereas the presence of the amnion is an example of a(n) **developmental** homology.<br /><br />Structural homology refers to similarities in the anatomy of different species that are inherited from a common ancestor. In this case, the presence of four limbs in various land-dwelling animals (reptiles, birds, and mammals) is a result of their shared evolutionary history.<br /><br />Developmental homology, on the other hand, refers to similarities in the developmental processes of different species that are inherited from a common ancestor. The presence of the amnion, a membrane that protects the embryo in the egg from drying out, is a characteristic shared by reptiles, birds, and mammals. This suggests that these animals inherited this trait from a common ancestor that also had an amnion.