A new moon occurs once every lunar month, and a lunar month lasts 29.5 earth days. Therefore, the new moon may occur either 29 days after this one, on the 30th of October, or it may occur 30 days after this one, on the 31st of October, since there can not be 0.5 days in a month.
The cell wall contains not only cellulose and protein, but other polysaccharides as well. The cell wall provides structural support and protection. Pores in the cell wall allow water and nutrients to move into and out of the cell. The cell wall also prevents the plant cell from bursting when water enters the cell.
