Explain the two Media of Transport in transport system of human​

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?

Which animal is a producer in this ecosystem

Several billion years ago which gas was the least prevailant in the atmosphere