> Even the hair that remains on the body of modern humans in the course of evolution has such a direction of growth that creates minimal resistance when swimming in water. The loss of hair cover in savannah makes no sense, whereas most aquatic mammals have either lost their hair completely or have only short wool left, since wool in water increases resistance when swimming quickly.
> A thick layer of subcutaneous fat is characteristic only of marine mammals, which allows them to survive in cold sea waters (even beyond the Arctic Circle). Modern humans, too, are exposed to hypothermia when in water that is colder than their body temperature. Therefore, subcutaneous fat allows a person to stay in the water much longer than in the absence of it.
> Bipedalism has no advantage in the savannah because movement on four paws is more expedient there (greater speed, more expedient body energy). In water, bipedalism with upright walking occurs quite naturally, purely reflexively - due to the need to breathe. That is, on two legs you can go much farther from the shore, and swim faster. It is also known that of birds, only penguins are fully adapted to life in the water, and they also stand upright both on the surface and in shallow water. Only humans and penguins are upright.
> The skin of modern humans is characterized by a high density of sweat glands, which are much higher than those of other primates. These glands produce two types of sweat: apocrine and eccrine. The apocrine glands are activated when emotionally aroused, and the eccrine glands are activated when the temperature rises. When on the surface, profuse sweating contributes to cooling the human body when outside temperatures are high. This evolutionary adaptation is too wasteful in the arid savannah, but acceptable and understandable when the primate inhabits a body of water.
> A thick layer of subcutaneous fat is characteristic only of marine mammals, which allows them to survive in cold sea waters (even beyond the Arctic Circle). Modern humans, too, are exposed to hypothermia when in water that is colder than their body temperature. Therefore, subcutaneous fat allows a person to stay in the water much longer than in the absence of it.
> Bipedalism has no advantage in the savannah because movement on four paws is more expedient there (greater speed, more expedient body energy). In water, bipedalism with upright walking occurs quite naturally, purely reflexively - due to the need to breathe. That is, on two legs you can go much farther from the shore, and swim faster. It is also known that of birds, only penguins are fully adapted to life in the water, and they also stand upright both on the surface and in shallow water. Only humans and penguins are upright.
> The skin of modern humans is characterized by a high density of sweat glands, which are much higher than those of other primates. These glands produce two types of sweat: apocrine and eccrine. The apocrine glands are activated when emotionally aroused, and the eccrine glands are activated when the temperature rises. When on the surface, profuse sweating contributes to cooling the human body when outside temperatures are high. This evolutionary adaptation is too wasteful in the arid savannah, but acceptable and understandable when the primate inhabits a body of water.
