An organism that produces its food by photosynthesis

An autotroph

Explanation:

Autotrophs are organisms that produce their own food. They do this through the process called photosynthesis. With the help of the green pigment called chlorophyll, they use water, carbon dioxide, minerals, and energy from the sun to produce oxygen, which they release into the atmosphere, and sugar, which they use as food. Most plants and some bacteria and protists belong to this group of organisms.

c. heat from the poles back down towards the equator.