What causes less cells to be produced 
Aging loss Oxygen Nutrition drought fat Sunlight coal
A B C D E F G H
Cells produce more cells by dividing into two cells.
Aging occurs because there are less cells produced 
What causes less cells to be produced  (A) Aging (B) loss (C) Oxygen (D) Nutrition (E) drought (F) fat (G) Sunlight (H) coal