What features of embryonic development prove the common origin of humans and animals?

In the process of development, the human embryo repeats certain stages characteristic of its distant animal ancestors, for example, it has gill arches, a tail, a two-chambered heart, etc., later these organs disappear.

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.