Answer:
The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers , but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40.
Explanation:
Glucose is broken down into sugar
Natural selection occurs to give help the best survival chance to the organisms.
About 37.2 trillion cells present in the body of an adult human.
