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:In biology, an organ are when tissues come together that structurally form a functional unit specialized to perform a particular function. Your heart is a example of organs
