Why is it important for chromosomes (dna to be copied before cell division?

Climate like that in the sahara desert have the fastest rates of weathering

Produce proteins by following coded instructions that come from the nucleus of the cell.

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.