The Theory states if my memory is correct. All living things contain one or more cells. And all living cells Come from preexisting cells. Robert Hooke discovered the cell while, Theodor Schwann and Matthias schleiden are credited to the creation of the cell theroy
There is only about 3 percent of freshwater on earth
This link should help you understand http://www.universetoday.com/20289/phases-of-the-moon/#
