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.

A:it is the foundation of most food chains

Explanation:

took the test on edge

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation:

im not in connections yet but i might can you some questions. what grade are you in?