Question

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.

Explanation:

Photosynthesis is carried out by plants, algae, etc. It produces organic compounds and oxygen using light energy. These organic - compounds form the base of most food chains as primary producers are consumed by herbivores and then by carnivores. Nitrogen gas in the air is mainly from the nitrogen cycle, not photosynthesis. Animals breathe in oxygen and release carbon - dioxide. While photosynthesis occurs in many ecosystems, its key importance is as the foundation of food chains.

Answer:

the foundation of most food chains.