Most mutations that occur in nature are harmful or neutral. Popularly speaking, they are "useless", and mutations that bring benefits to organisms are extremely rare. However, in the process of biological evolution, there is no almighty God or self-righteousness. The elite of the world, at the time of each mutation, the organism does not know whether the mutation is useful, and only after it changes the phenotypic characteristics of the organism, it will be subject to natural selection. When the organism, especially the most tenacious on the earth, When creatures are in trouble, they will increase the chance of beneficial mutations by increasing the mutation rate, that is, increasing the chance of solving difficulties. The most accurate summary of this text is:. ['Most mutations in nature are "useless".', 'The organism will produce appropriate mutations according to its actual situation.', 'Nature is colorful because it tolerates countless "useless" mutations.', 'Humans should help the natural world to eliminate "useless" mutations, thereby enriching the natural ecology.']