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• 1. All living things are made of one or more cells.
• 2. Cells are the basic unit of structure and function in organisms.
• 3. All cells arise from existing cells.
Small cells function more efficiently than large cells
• Small cells can exchange substances more rapidly than large cells because small objects have a higher surface area to volume ratio.
• Substances don’t need to travel as far to reach the center of a small cell.
• Cells must be small as larger cells find it difficult to bring in enough food, and export enough wastes to keep the cell alive.
• As cell size increases, the ratio of cell volume to cell surface area decreases. At some point as cells increase in size, there isn't enough cell membrane to adequately supply the cell interior with enough oxygen, water, and food. When this happens, the cell dies.