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

Explanation

In complex multicellular organisms, specialised cells make up tissues, tissues make up organs, organs make up organ systems, and finally organ systems make up organisms. Since complex multicellular organisms have a very high degree of organisms in their body, they cannot be reproduced from their cut body parts by the process of regenarations. For example, a dog is a complex multicellular organism which canno tbe regenerated from its cut body part say, a cut tail. This is because the cells present in the cut tail of a dog cannot produce dog's organs like heart, brain, lungs, stomach, intestines and limbs etc., needed for the making of a complete dog. The complex multicellular organisms need more complex ways of reproduction like sexual reproduction.