Answer: Option A.
Explanation: The correct answer to the question is option A, because not all proteins are made up of some combination of 20 essential amino acids.
1the atmosphere<span> also protects living </span>things<span> on Earth from the sun's harmful ultraviolet radiation. 2</span>tmosphere filters out these dangerous rays. 3The atmosphere<span> also helps to sustain life of Earth. .4blocks harmful electromagnetic 5.provide oxgen</span>
air pressure is usually exerted counterclockwise
<span> the period of the cell cycle prior to mitosis, during which the chromosomes are replicated. Origin of </span>S phase<span> Expand.</span>
Answer:
Has an excess of H+ ions and would be called acid
