There are two types of nutrition of living organisms: autotrophic and heterotrophic.
Autotrophs (autotrophic organisms) are organisms that use carbon dioxide as a source of carbon (plants and some bacteria). In other words, these are organisms capable of creating organic matter from inorganic ones – carbon dioxide, water, mineral salts.
Heterotrophs (heterotrophic organisms) – organisms that use organic compounds (animals, fungi and most bacteria) as a carbon source. In other words, these are organisms that are not able to create organic substances from inorganic ones, but need ready-made organic substances. According to the state of the food source, heterotrophs are divided into biotrophs and saprotrophs.
Depending on living conditions, some living creatures are capable of both autotrophic and heterotrophic nutrition (mixotrophs).
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