Why do people of different races belong to the same species?

1) People of all races belong to the species reasonable man, because they have the same number and shape of chromosomes in somatic cells,
2) from interracial marriages, prolific offspring are born,
3) they are similar in structure, life, mental development.

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.