1) Ensure the continuity of generations;
2) provide the transmission of hereditary information and a combination of characters;
3) the egg cell provides the development of the embryo due to nutrients, and a large number of sperm cells increases the likelihood of fertilization, in some animals offspring develops offspring (the phenomenon of parthenogenesis).
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.