Dioecious plants have;

Dioecious and monoecious plants actually have something in common, in that they both bear unisexual flowers. This means that each bloom has only male or female reproductive parts. With dioecious plants, the male and female blossoms appear on separate plants. With monoecious plants, each plant has both male and female flowers.

Explanation:

With dioecious plants, the male and female blossoms appear on separate plants. With monoecious plants, each plant has both male and female flowers. By contrast, some plants have blooms that are bisexual. Each individual bloom has both male and female parts.

the correct answer is:

a population changes in response to a change in the environment.