Which are autotrophs ?

An autotroph is an organism that can produce its own food using light, water, carbon dioxide, or other chemicals. Because autotrophs produce their own food, they are sometimes called producers. Tiny organisms that live in the ocean are autotrophs. Some types of bacteria are autotrophs.

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Explanation:

Those who can make their own food by the help of abiotic components like light , sun and water are called autotrophs. Such as Green plants. They make their own food. They don't depend on any other biotic for food. Autotrophs can make their own food cause they contain chlorophyll.

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i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.