有害还是有益?微生物包括细菌、酵母、霉菌、原生动物及一部分蕈类,有时也把蕈类、地衣包括进来。因为酵母、霉菌及蕈在分类上称为真菌,所以微生物主要是菌类。微生物的身体小。繁殖迅速,适应能力强大,代谢种类多样化,在自然界内起着重大的作用。没有微生物的活动,就不可能有植物及动物。植物生长所依赖的土壤肥料,主要是微生物分化有机物造成的,动物的食料都是直接问接来自植物,而人们吃的又是动物及植物。生物死后的尸体也是依靠微生物分解的,所以,微生物在地球上的物质循环中,也是不可缺少的一个重要角色。自有人类以来,就不断的在了解微生物的特性,并且利用微生物的特性为人们生产有用的东西。人类的知 Harmful or beneficial? Microorganisms include bacteria, yeasts, molds, protozoa, and a few species of cockroaches, and sometimes include cockroaches and lichens. Because yeasts, molds and cockroaches are called fungi in the classification, microorganisms are mainly fungi. The body of the microorganism is small. Rapid reproduction, strong adaptability, diversification of metabolic species, and play a major role in the natural world. Without the activity of microorganisms, there can be no plants or animals. The soil fertilizers on which plants depend are mainly caused by the microbial differentiation of organic matter. Animal foods are directly from plants, and people eat animals and plants. The dead body of a living creature is also decomposed by microorganisms. Therefore, microorganisms are also an indispensable and important role in the material circulation on Earth. Since the beginning of human life, we have been constantly understanding the characteristics of microorganisms and using them to produce useful things for people. Human knowledge