You need amino acids in your diet every day, since your body doesn't store excess amino acids consumed. If essential amino acids are missing from your diet, your body will start breaking down muscle tissue to access the amino acids that is contains so they can use them elsewhere.
I also believe the answer is A.
Consists of cranial and spinal nerves carrying impulses to and from the brain and spinal cord
The mitochondria is the powerhouse of the cell. on a serious note, The most prominent roles of mitochondria are to produce the energy currency of the cell through respiration, and to regulate cellular metabolism