Ontogenesis is an individual development of an organism. In multicellular organisms, ontogenesis begins with the formation of a zygote (during sexual reproduction) or from the moment of separation of the offspring from the mother (during asexual reproduction) and continues until the end of life. In unicellular organisms, it begins from the moment an organism is formed in the process of division of the maternal individual and ends with division or death.
In animals, two periods of ontogenesis are distinguished – embryonic (embryonic) and postembryonic (postnatal).
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.