What is the importance of a zygote

The zygote contains all the essential factors for development, but they exist solely as an encoded set of instructions localized in the genes of chromosomes. In fact, the genes of the new zygote are not activated to produce proteins until several cell divisions into cleavage.

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the answer is b.) hydrogen bonds between bases.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;