Answer:
On the basis of nutrition, organisms are
classified as autotrophs and heterotrophs.
Autotrophs are further categorized into
photo autotrophs and chemo autotrophs, while heterotrophs may be parasite pred
or a saprophyte etc.
Microbes are saprotrophs and
derive nourishment or energy from dead organic matter or remain of plants and
animals and this digestion is extracellular.
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