Which of the Following Is an Example of an Environmental

Multiple Choice

Which of the following is an example of an environmental constraint on evolution by natural selection?

A) The availabilities of different types of food are inconsistent from year to year on Daphne Major, so finches with the "perfect" bill size in one year may be at a disadvantage in another year.
B) Dolphin embryos grow hindlimb buds during development, even though they do not have or need hindlimbs as adults.
C) Female humans have nipples with mammary glands; males have nipples too but are unable to produce milk.
D) Certain proteins in humans have similar amino acid sequences to those found in yeast because we have been unable to evolve more sophisticated sequences.
E) Hox genes are found in both Drosophila and humans and are important in the development of body parts.