Which of the following best describes the presence of gill structures in vertebrate embryos and tail structures in embryos in the great apes?
a. These are vestigial structures that are residual parts from a past common ancestor.
b. These structures continue to be necessary for survival in the adult form of these organisms.
c. These structures show that these species have been isolated since the separation of the supercontinent Gondwana.
d. Vertebrate organisms are more closely related to fish than to marsupials.
a. These are vestigial structures that are residual parts from a past common ancestor.
The presence of gill structures in vertebrate embryos and tail structures in the embryos of great apes are both vestigial structures that are residual parts from a past ancestor. They are no longer necessary in these organisms’ adult form.
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