Question

Giraffes with short necks tend to be unable to access enough food, while

giraffes with long necks can reach more food at the tops of trees. This causes an
advantage for giraffes with long necks. How would you explain this?

A. This is an example of a disruptive selection in which the population of cacti is
divided and well-defined.

B. This is an example of a stabilizing selection in which the intermediate form of a
trait is advantageous compared to the extreme forms of the trait.

C. This is an example of bidirectional selection in which evolutionary pressures from
multiple sources encourage an organism to adapt.

D. This is an example of directional selection in which one end of the bell curve is
better adapted to its environment than the other end.

Answer 1

D. This is an example of directional selection in which one end of the bell curve is better adapted to its environment than the other end.

Step-by-step explanation:

Directional selection is when one extreme end of a trait of a population is favored. In this scenario, the trait being discussed is the length of a giraffe's neck with the long necked giraffes having an advantage. Their ability to reach more food increases their chances of making it to reproductive age and pass on their genes. Therefore, natural selection pressures giraffes to adapt and evolve over time to increase their chances of survival as a species.

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