What signs developing in the human embryo indicate its animal origin?

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.

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