1- Living things Grow by producing more cells. 2- On average, the cells of an adult animal are no larger than those of a younger animal, there are just more of them. 3- To produce more cells, the preexisting cells divide 4- Two reasons why cells divide are: The larger a cell gets, it places more demand on its DNA. the cell has more trouble moving nutrients and waste across the cell membrane. SA=l*w*6 V=l*w*h