Average human males are most likely to be attracted to women with a waist to hip ratio of 0.72. women with this waist to hip ratio are also the most fertile. by being attracted to women with a waist to hip ratio, a male is increasing his chances of having children and thus improve his .

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?