The world's population:   is unequally distributed  lives primarily in agricultural areas  decreases slightly each year  all of the above

is unequally distributed

Explanation:

because my finals say so

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error