Multicellular organisms have many cells. what is the one other characteristic they must have before they can be called multicellular? a. the cells must be small. b. they must be autotrophs. c. they must be heterotrophs. d. the cells must be specialized.

The answer is D. the cells must be specialized.

Explanation:

A multicellular organism is one that is constituted by two or more cells which arise from a single cell which multiplies generating an organism. The cells of multicellular organisms are differentiated to perform specialized functions and reproduce by mitosis and meiosis. Cellular specialization includes the division of biochemical functions, the specialization of cells for contact with the environment and the separation between somatic cell and germ cell.

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