Question

what is the biggest difference between one cellular organism and a multicellular organism?
how are they organized
how they are related
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Explanation:

Unicellular organisms consist of a single cell that performs all life functions, while multicellular organisms are made of many specialized cells organized into tissues, organs, and organ systems. This core difference lies in their structural and functional organization. The option about "how they are related" is irrelevant to their defining difference.

Answer:

How are they organized