Question

why do multicellular organism use complex way of reproduction​

Answer 1

Explanation:

Multicellular organisms cannot reproduce by cell because they are not simple random collection of cells. ... Multicellular organisms, therefore, require to use more complex ways of reproduction.

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Answer 2

Answer:

In them, cells are organised into specialised groups/tissues, organs and/or systems, each of which occupy specific locations in the body. In such an organised condition, cell-by-cell division would be impossible. Hence multicellular organisms need complex methods of reproduction.