Animals and most microorganisms are classified as chemoorganoheterotrophs. the prefixes "chemo," "organo," and "hetero" refer to how the organism meets its needs, respectively, for

“chemo” refers to energy source (reformed molecules)how the organism obtains electrons (from the oxidation and reduction-redox)

“organo”-refers to electron donor (organic substrate and compound)

“heterotroph”-refers to carbon source (organic compounds).

Examples of chemoorganoheterotrophs are decomposers-obtain carbon and electron reactions from dead organic matter, herbivores and carnivores- obtain carbon and electron reactions from living organic matter.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.