In the early period of development, the heart of a human embryo consists of one atrium and one ventricle. Comment on this fact.

The human embryo in the process of individual development repeats the passed stage of evolution (a two-chamber heart is a sign of fish).

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.