Ineed on these questions, i don't understand.
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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.

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?