Photosynthesis is important to living organisms because it is

the foundation of most food chains.
the source of nitrogen gas in the air.
how animals get carbon dioxide to breathe.
the process that occurs in most ecosystems.

Respuesta :

Plants let out carbon dioxide and let in oxygen. Humans and animals breathe in carbon dioxide and breathe out oxygen.

Answer:

A:it is the foundation of most food chains

Explanation:

took the test on edge