Being able to adapt to an environment is important if a population of organisms is to survive. Which of the following most accurately describes the adaptation needed to live in a lake?

A. At the surface, organisms must have adaptations that help them survive under great pressure and warmer waters.

B. To live at the middle depths of a lake, fish must have adaptations that allow them to survive in areas with an abundance of nutrients.

C. Organisms that live at the bottom of the lake must be able to survive colder temperatures and a decrease in oxygen availability.

D. Photosynthetic organisms survive using available light at the middle and deep depths of the lake.