The theory seeks to explain human traits such as hairlessness, salty tears, fat tissue, [[bipedalism]] and sweat glands. It also explains why human body is streamlined and why apes quickly drown when put in water while humans do not. | The theory seeks to explain human traits such as hairlessness, salty tears, fat tissue, [[bipedalism]] and sweat glands. It also explains why human body is streamlined and why apes quickly drown when put in water while humans do not. |