Answer:
To carry out life processes like breathing, respiration, digestion, excretion etc.
Explanation:
Answer:
Normal distribution/Bell-curve
Explanation:
I'm not quite so sure as to the distribution type, but it is definitely a bell curve.
Answer:
Basically, together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.
Explanation: