What do the common and mutational variability have in common?

General: both types of variability are due to changes in the genetic material.
Differences: combinational variability arises due to recombination of genes during gamete fusion, and mutational is caused by the action of mutagens on the body.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.