What form of variability is the starting material for natural selection?

Individuals have new traits as a result of mutations, after which individuals with new traits enter the struggle for existence and natural selection. Mutational variability is the basis of the evolutionary process.

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.