Explain what signs determine the proximity (kinship) of organisms and their species.

The affinity of organisms can be determined by examining their DNA (deoxyribonucleic acid). A DNA molecule is a carrier of hereditary information of the cell and the body as a whole. In the cells of organisms of each species there is a certain number of DNA molecules per cell. The sequence of nucleotides in a DNA molecule is always strictly individual and unique for each biological species.

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.