What is the relationship between protein and DNA?
a. DNA is made of protein created in the cell.
b. Protein is made up of DNA that is stored in the cell.
DNA instructs how the protein is made.
The cell is made of only DNA and protein

C. DNA instructs how the protein is made.

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try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)