In human embryonic development, there are traits characteristic of all representatives of the Chordata type: these are the chorda, the neural tube on the dorsal side of the embryo, and the gill slits in the throat.
From amphibians, a man inherited swimming membranes between the fingers that are present in the embryo. Weak heat regulation in newborns and children under 5 years old indicates an origin from animals with an unstable body temperature. The fetal brain is smooth, without convolutions, as in the lower mammals of the Mesozoic era. A six week old fetus has several pairs of mammary glands.
The animal origin of man is confirmed by a number of properties that indicate that man is the result of a long evolution of vertebrates. In the embryonic period of development, a two-chamber heart, six pairs of branchial arches, and a tail artery, signs of fish-like appendages, are laid in the human embryo.
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.