Phytoplankton are only found at the surface of ocean waters because
a. they feed on tiny organisms living at the surface.
b. they are an important food source to surface-dwelling marine organisms.
c. they require sunlight to carry out photosynthesis.
d. they cannot withstand the colder temperatures of deep water.

1. -define adaptation2 explain darwin's theories of descent with modification and natural selection in detail3. -explain how each of these provides evidence for evolution: a. -fossil record, including superposition and transitional fossilsb-anatomy, including homologous structuresc-biological molecules, including dna and proteins4. -explain the difference between convergent and divergent evolution.5. -define and give three examples of artificial selection6. -define and give one example of coevolution.7. -explain biodiversity and how it benefits humans.8. -explain a type of population lest affected by environmental change.