Every cell of the body needs oxygen for the process of cellular respiration by which the energy in food is converted into energy that can be used by the body's cells. During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, and the energy is transferred to ATP
A reference Indicates Whether the Test taker did worse Better
To separate each species into their own classes to better study them.
That would be sexual reproduction, where genes of both parents are passed down to the offspring.
The answer is B) 9 neutrons