Learn about Cells
The cell is the basic unit of life. Another thing to know is that an organism can be made of only one cell such as a plant cell. Organisms that only have one cell are called unicellular organisms. There are organisms that have a lot of cells such as the human body. These organisms are called multicellular organisms. All cells are created from the existing cells. First they start off as one cell and then it splits into two cells. That process is called cell division. Another important fact has something to do with the cell membrane. Cell membranes are selectively permeable which mean that the cell membrane only lets certain things go in and out of the cell. It's like a barrier that only lets certain things go through. These are all important facts of the cells.