Answer: Option C.
The number of protons and neurons it's contain.
Explanation:
Mass number of an atom is also called atomic mass of an atom which is some what expressed in Dalton i.e 1/2. The mass number is the total number of protons and neutrons altogether called nucleons in an atomic nucleus.
True vocal cords is the answer <span>ʕ•ᴥ•ʔ</span>
Carbon fixation, reduction phase, carbohydrate formation, and regeneration phase.