Question

what is directly responsible for providing energy to phytoplankton in the ocean?
a. sun
b. fuel
c. animals
d. water

Explanation:

Phytoplankton are photosynthetic organisms. They use sunlight to perform photosynthesis and produce energy - rich compounds. The sun provides the light energy necessary for this process. Fuel is not a natural energy source for phytoplankton. Animals do not directly provide energy to phytoplankton. Water is a medium for phytoplankton but does not provide energy.

Answer:

A. Sun