Instead of defending life, scientists have to

-describe the characteristic life
- not differentiate between living and non - living
- qualify living things as things that can move
qualify life things as highly complete

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?