Methods for feeding plants, animals and bacteria.

Some plants, many microorganisms, and all animals have three functions: food intake, digestion, and excretion.

Green plants are, of course, the majority of autotrophic organisms on Earth. In the process of photosynthesis, plants use light energy to synthesize organic matter.

Animals and most microorganisms are heterotrophic and must absorb organic nutrients – carbohydrates, proteins and fats – and rearrange them in a form suitable for their own needs.



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