It is divided into autotrophic type and heterotrophic type.

Autotrophic: Green plants gain energy through photosynthesis (transforming inorganic substances into organic substances).

Heterotrophication: Animals gain energy by eating (using ready-made organic matter).

Alienation is to release one's own material and energy for one's own growth and development (in fact, it is cell respiration).

It is divided into aerobic, anaerobic and facultative.

Aerobic type: only aerobic breathing, decomposition of their own organic matter, release energy.

Anaerobic type: can only breathe without oxygen, decompose its own organic matter and release energy.

Facultative: Both aerobic breathing and anaerobic breathing are acceptable.