Today, 170 years ago, on June 7, 1855 (Calendar 23 April 1855), the famous Russian botanist Michelin was born. Michelin, born on June 7, 1855, was a Russian plant breeder. He made outstanding contributions to the cultivation of fruit trees, and there are more than 300 new varieties of fruit trees throughout his life. Michelin proposed that the basic principles of biology are the unity of the main object and living conditions. He believed that biological conditions are highly selective about living conditions, and living conditions dominate the development and genetic variations of organisms. Genetic is one of the basic biological characteristics, and in the process of individual development, geneticity can also be changed and developed, and genetic forms can be obtained. Human control of living conditions, or conducting sexual or non-hybridization, and means such as