Chlorophyll-containing algae, such as cyanobacteria and Chlamydomonas, are mostly autotrophs and have heterotrophic life under different conditions. Such as gymnosperms, Chlamydomonas, Rhodophyta pluvialis and Dunaliella salina, can carry out photosynthesis under sufficient light and nutrition conditions; When there is no light, saprophytes are cultivated and animal and plant carcasses are decomposed to meet nutritional needs.