Question

why can a more complex organism can not give rise to new individuals through regeneration??

Answer 1

The tissues in complex organisms cannot regenerate a new individual as they are highly differentiated to perform specialized functions. For example, human skin cannot regenerate into a new individual as it is a highly differentiated tissue performing a designed function.
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Answer 2

1. Complex organism body are highly complicated.

2. There are specific organ to perform specific function.

3. There is a Labour division in the body of the complex organisms.

4. Regeneration is carried out by specialised cells which are not present in complex organism.