The correct answer is carboxyl group.
<span>The carboxyl group is an organic functional group consisting of a carbon atom double bonded to an oxygen atom and single bonded to a hydroxyl group (COOH). It is the main functional group of carboxylic acid. Carboxylic acids are found in acetic acid and the amino acids that are used to build proteins.</span>
Answer: The RNA strand is AUAAUCGGUCGCG
Explanation: The nucleotide sequence of RNA has four bases namely: Adenine A, Uracil U, Guanine G and Cytosine C. DNA nucleotide sequence has four bases namely: Adenine A, Thymine T, Cytosine C and Guanine G. In RNA, A pairs with U, and C pairs with G. In DNA, A pairs with T and C pairs with G.
The change in crab color is an example of Disruptive selection because two extreme colors were preferred over the more moderate color. Thus, the correct option for this question is D.
<h3>What is Natural selection?</h3>
Natural selection may be defined as the selection of a few individuals from any given population according to their favorable variations.
Disruptive selection occurs when environmental conditions changes in two different directions. Due to which variance increases in population.
Therefore, the correct option is D.
To learn more about Natural selection, refer to the link:
brainly.com/question/14385908
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