Why are carbohydrates important to organisms?

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

How many years would it take the atlantic ocean to grow 500 centimeters? show your work.

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?