The answer is (1) C-14 and C-12. The life on the earth is carbon based. Carbon is important in living organisms. So C-14 and C-12 can be used to date the remains of a once-living organism.
Answer:
The nucleus
Explanation:
The center of the atom is made up of the nucleus.
Cumulus, stratus, and cirrus, there's many more but these are the main ones ^^
I believe this would be a physics questions.