Question

What is regeneration? Give one example of an organism that shows this process and one organism that does not. Why does regeneration not occur in the latter?

Hint:

Regeneration is most effective in organisms with simpler body structures, like starfish, and is less common in complex organisms such as humans.

Answer 1

Regeneration: Regeneration is the biological process by which an organism is able to regrow certain parts of its body that have been lost or damaged. It is an example of asexual reproduction in certain organisms where new cells grow and differentiate to replace the lost body parts. Example of an organism showing regeneration: The starfish is a good example of an organism that shows regeneration. If a starfish loses an arm, it can regenerate a new one from the remaining part of the body. 
Example of an organism not showing regeneration: Humans do not show regeneration. Once a part of the body, like a limb, is lost, it cannot grow back. 
Why regeneration does not occur in humans: Humans have a more complex body structure, and their cells are more specialized. Regeneration, which requires the ability to produce undifferentiated cells, is limited in humans due to the complexity of their cell differentiation and repair mechanisms.