HELLP PLEASE

how is it that a code consisting of only four letters, as in dna a,t,g,c can specify all the differnt parts of an organism and account for all the diversity of organisms on this planet? I don't understand the ? please help!!!

compare and contrast: below are two equations. solve each equation and compare the two solutions. choose the statement that is true about each solution. equation #1 2x-3=-17 5x+3=12 A. equation #1 and equation #2 have the same number of solutions B. equat...