Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?

More complex organisms have high level of tissue differentiation and these tissues are highly specialized in their functions. The body has organ-system level of organisation. They can regenerate few damaged tissues but cannot regenerate organ or organ sysytem. Therefore, more complex organisms cannot give rise to new individuals through regeneration. Regeneration is only possible in lower and simple organisms that do not show complex cellular differentiation.