What kinds of mutations were more beneficial? Why?

Various organism goes through mutations, all through their life. And these mutations are the genetic code changes, and the genetic codes are DNA. Though, in various instances, the mutations are beneficial to any of the organisms. And all these beneficial mutations like tolerance of Lactose as well as the rich vision of the colors, are the perfect example to prove this fact.

Explanation:

This is a Biology question. However, I am answering:

Various organism goes through mutations, all through their life. And these mutations are the genetic code changes, and the genetic codes are DNA. Though, in various instances, the mutations are beneficial to any of the organisms. And all these beneficial mutations like tolerance of Lactose as well as the rich vision of the colors, are the perfect example to prove this fact.