The following statements about the composition of the ecosystem are correct: () A. Autotrophic organisms belong to producers, all of which can carry out photosynthesis and turn inorganic substances.

A, autotrophs can be light energy autotrophs, or chemical energy autotrophs, all of which convert inorganic substances into organic substances. A is wrong;

B, most animals belong to consumers, and some animals, such as dung beetles and earthworms, are decomposers. B is wrong;

C, saprophytes are decomposers and an indispensable part of the ecosystem, and C is correct;

D, bacteria belong to biology, D is wrong.

So choose: C.

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