Growing cells need large surface areas to volume ratios.
The surface area to volume ratio of a cell is the area the cell covers in relation to its volume.
Small cells have a large surface area to volume.
As small cells increase in growth through their volumes, they need to maintain the large surface area to volume ratio in order to be able to carry out important life processes via simple diffusion.
Otherwise, some other methods have to replace simple diffusion in order for materials to be circulated around the cell.
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