Which of the following is an example of natural selection? a. to produce a more desirable fruit, a farmer crosses a tree that produces sweet oranges with a tree that produces large oranges. b. cricket frogs prefer to sleep during the day, while red-eyed tree frogs prefer to sleep during the night. c. pesticides are sprayed in a field, resulting in an increase in crop growth and a decrease in insect population. d. rabbits with a mutation for longer, thicker fur survive an unusually cold winter, while many normal rabbits do not survive.

It should be D, because the rabbits that survived did so due to natural selection.

The answer is D. Rabbits with a mutation for longer, thicker fur survive an unusually cold winter, while many normal rabbits do not survive.

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: