An ectotherm is an animal that is dependent on external sources of body heat
An endotherm uses heat that its body produces
So the best likely answer would be C.<span> whether or not the animal maintains a constant body temperature</span>
Global warming? In think that's it, but don't trust me.
The correct answer is D. flowers and fruit that provide a reproductive advantage.
Angiosperms are flowering plants. These are most successful plant groups. Angiosperms produce flowers and seeded fruits, which are distinguishing features of the angiosperms. several colors of flowers attract agents for pollination that help to increase diversity in angiosperms. Enclosed seed in angiosperms protect them from dessication and for better dispersal.
