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More complex animal have complex body design. Its is difficult to grow from regeneration.
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Because organisms like hydra and planaria are simple organisms their body consists of a single kind of cell all through out. And hence they can grow or develop any part of their body into becoming a new individual.
However in humans we have organ- system level of differentiation i.e all the organs work together as an integrated force and hence we do not just have a single cell in our body unlike hydra or planaria. However humans can regenerate lost body parts such asm blood,muscles,etc but from these parts new individuals cannot be formed.
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