7. What is the original evolutionary function of the CRISPR-Cas9 system in bacteria?
(A) To serve as a mechanism for repairing spontaneous DNA mutations within the genome.
(B) To regulate the expression of the bacteria's own metabolic genes during starvation.
(C) To facilitate the conjugation process and horizontal gene transfer between bacteria.
(D) To act as an adaptive immune system that memorizes and cleaves foreign DNA from phages.
(E) To assist in the structural formation of endospores during extreme environmental stress.

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