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Why is cell-by-cell division impractical for complex multicellular organisms?

Question
Why is cell-by-cell division impractical for complex multicellular organisms?
Because their cells lack a nucleus
Because tissues and organs must be maintained at definite, organised positions in the body
Because such organisms have no DNA to copy
Because they reproduce only sexually
Answer
Because tissues and organs must be maintained at definite, organised positions in the body
Detailed Explanation
Complex organisms have specialised cells organised into tissues and organs at fixed positions, making random cell-by-cell division impractical.
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