Answer:
To carry out these functions, DNA sequences must be converted into messages that can be used to produce proteins, which are the complex molecules that do most of the work in our bodies. Each DNA sequence that contains instructions to make a protein is known as a gene.
Explanation:
In humans, oxygen is delivered to the cells of the body by the circulatory system.
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Answer is C. The acid/base couple associated with it is COOH/COO-
