Final answer:
Cells are the fundamental units of multicellular organisms while organs are made up of multiple cells working together. Molecules exist within cells but are not at the level of pluricellular organization.
Explanation:
Cells are the smallest independently functioning biological units of an organism in a multicellular system. In a multicellular organism, units such as organs are comprised of multiple cells working together to perform specific functions. On the other hand, molecules are smaller units found within cells but not at the level of a pluricellular organism like an organ.
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