The movement of material by water, wind, or ice

Which of the four major uses is predicted to change the least by 2020?

Ryan rears sheep for their wool. recently the quantity of wool that ryan gets has diminished. this is because the new sheep are not that wooly. ryan should add which nutrient to their feed so that the sheep becomes more wooly? a.cornb.ironc.cottonseedd. vitamin a

Provide one reason why mitosis occurs.