Biological factors play a major role in the development of mental illness. 生物因素在精神疾病的發展過程中起著很重要作用。
Herbivory and the interaction with epiphytes are the most important biotic factors affecting the biomass and production of seagrasses. 非生物因素一般有最適合海草生長的範圍,生物因素的影響具有兩面性。