The vast majority of mutations in nature are harmful or neutral, which is commonly referred to as useless  Mutations that bring benefits to organisms are extremely rare  However, in the process of biological evolution, because there is no omnipotent God or self righteous elite, organisms do not know whether this mutation is useful at the time of each mutation  Only when it changes the phenotypic characteristics of organisms will it be subject to natural selection
When organisms, especially the most tenacious creatures on earth, are in trouble, they will increase the chance of beneficial mutations by increasing the mutation rate, that is, the probability of solving difficulties
The vast majority of mutations in nature are useless