Plants remove carbon dioxide from the atmosphere, and release oxygen into the atmosphere. Humans and animals remove oxygen from the atmosphere, and release carbon dioxide into the atmosphere.
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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A. Variation in the gene pool