DENDROLOGY

Detailed explanation-1: -The variation which is beneficial is decided by the ecological niche of the organism. It is necessary for the survival of species as only then will the species have the adaptability to survive in rapidly changing external conditions.

Detailed explanation-2: -Variations are beneficial for living organism as it helps in increasing the chances of survival of the particular organisms this helps them to be more advanced and more immune. They can sometime lead to a genetic defect hence becoming a harmful procedure.