Amino acids are acids on one hand, and a base on the other hand.
<h3>What is an acid?</h3>
An acid is a substance that produces hydrogen or hydroxonium ions as the only positively charged ion when it ionizes.
All amino acids have an amine group -
and a carboxylic group -
.
The carboxylic group ionizes such that:

The presence of the amine group enables amino acids to also act as a base.
More on amino acids can be found here: brainly.com/question/14583479
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I’m sorry but do you want me to answer all of these I just need a yes or no I’ll answer in the comments (:
I think it is erosion (2) because erosion removes soil, rock, and dissolved material.
Sources of heat from inside earth is radioactive decay and residual heat.