Autotrophic: A kind of nutrition that uses organic matter made by itself to maintain life, called autotrophic, or refers to carbon dioxide or carbonate as the only carbon source, which can be metabolized and synthesized by simple inorganic nitrogen.

Heterotrophication: Inorganic substances can't be directly synthesized into organic substances, and ready-made organic substances must be ingested to maintain life, which is called heterotrophy.

Aerobic: in the process of alienation, organisms must constantly absorb oxygen from the external environment to oxidize and decompose their own components, thus releasing energy and discharging carbon dioxide. This type of metabolism is called aerobic metabolism.

Anaerobic: refers to organisms or cells that can grow without or without molecular oxygen.