1, * * * was born.
Mutual benefit means that two creatures live together, which is beneficial to each other. After separation, they cannot live independently.
2, parasitism.
Parastisu means that two creatures live together, one benefits and the other suffers, and the latter provides nutrients and living places for the former. This biological relationship is called parasitism.
3. saprophytic.
Saprophage is a way for organisms to obtain nutrition. Any organism that obtains nutrients from animal and plant carcasses or decaying tissues to maintain its own life is called saprophyte. Most molds, bacteria, yeast and some higher plants are saprophytes. Aerobic decomposition of saprophytic bacteria in soil is a necessary link of material circulation.
Inorganic substances cannot be directly synthesized into organic substances, and ready-made organic substances must be ingested to maintain a nutritious lifestyle. This is the so-called heterotrophs. Heterotrophication is autotrophic; Plants are basically autotrophic and animals are basically heterotrophic.