 Having a smaller cell size means there is more surface area per unit of volume  This means more things can move across the membranes of the cell  Wastes  Products

 There is a smaller distance for things to move across  Which makes it faster!

 Our cells need to do things quickly so that our cells can get things done, so that our body can function

 When cell size is smaller, you can have a lot more cells  This is good, because cells don’t live as long as we do  At first they can be repaired if they break, but eventually they die and get recycled

 If we only had two cells in our eye, for instance, if one of them had to be replaced we might go blind until a new cell was produced  When you have a lot, one can die and get replaced without you noticing