What is meant by the following statement?

"acceleration is inversely proportional to mass."

acceleration decreases as mass decreases.
acceleration and mass are opposites.
acceleration increases as mass decreases.
acceleration is not affected by mass

idk what the question is about

elements make up everything, and they combine to make compounds.

the answer is c

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.