The actual answer is, "A", an ocean trench.
You can find out more about them by researching them up on Google, it's only a few phrases and a hit on the enter key :P
Answer:
your not aloud to do tests on here or at least don't say that for next time.
Explanation:
<span>by collecting “proxy data” from tree rings, ice cores, and historical records</span>
Answer:
carbon, hydrogen, nitrogen and oxygen
Explanation:
mostly, combination of carboxylic and amine groups
