What is an autotroph? Why are nitrogen-fixing microorganisms not autotrophs? Can't it make use of nitrogen in the air? It is also an inorganic substance.

Autotrophic organisms refer to organisms that use inorganic nutrients to synthesize organic nutrients in their own bodies, so as to survive and reproduce.

Nitrogen-fixing microorganisms are generally divided into the following three categories:

1, autotrophic nitrogen-fixing bacteria, refers to a kind of microorganisms that can fix nitrogen independently without relying on other organisms. Autotrophic bacteria (a variety of cyanobacteria

Cyanophyta can fix nitrogen and belongs to autotrophs; Rhizobia or something is a consumer, heterotrophs.

Autotrophic and heterotrophic are only energy utilization channels, and both exist.

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