Question

question 23 of 25
what condition must exist in a population for natural selection to occur?
a. all of its members must be poorly suited to changes in their environment.
b. some of its members must be better suited to their environment than others.
c. all of its members must be well suited to a variety of environments.
d. most of its members must have very similar traits.
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Explanation:

Natural selection requires variation in fitness. If some members are better - suited (have higher fitness), they are more likely to survive and reproduce. Option A is incorrect as not all need to be poorly - suited. Option C is wrong because being well - suited to a variety is not a requirement for natural selection (which is about differential survival in a particular environment). Option D is incorrect as similar traits would not allow for differential survival and reproduction which is key to natural selection.

Answer:

B. Some of its members must be better suited to their environment than others.