In order for cell differentiation to occur 1)DNA must be transcribed into RNA 2)Cells must undergo binary fission 3)DNA must cross over during mitosis 4)Cells must transfer DNA from one cell to another

Which of the following may one conclude from a map that shows the average ph value of rainfall in the u.s.? acid rain is a more serious problem on the east coast. acid rain falls equivalently across the continental u.s. there are more factories on the west coast. the midwest has fewer forests than the rest of the u.s.