Can someone help me please

After hydrogen and oxygen, witch element makes up almost all of the most common substance in your body

What was photo 51 with rosalind franklin?

Which of the following is the best definition of aerobic respiration? o a. the cellular process that releases energy by breaking down glucose o b. physical activity that involves the repeated motion of large muscle groups o c. physical activity that increases heart rate and breathing rate o d. the cellular process that converts solar energy to chemical energy