How do living things get their food?

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Hi my lotter friends U know How do living things get their food The general requirement for energy and materials is common in all organisms, but it is fulfilled in different ways. some organisms use simple food material obtained from inorganic sources in the form of carbon dioxide and water. These organisms the autotrophs, include green plants and some bacteria. Other organisms utilise complex substances. These complex substances have no be broken down into simpler ones before can be used for the upkeen and growth of the body. To achieve this, organisms use bio-catalysts called enzymes. Thus the heterophs survival depends directly or indirectly on autotrophs. Heterotrophic organisms include animals and fungi. I read it in a books when I am in school