Why do cells need to have a high amount of surface area relative to their volume

The important point is that the surface area to the volume ratio gets smaller as the cell gets larger. Thus, if the cell grows beyond a certain limit, not enough material will be able to cross the membrane fast enough to accommodate the increased cellular volume. That is why cells are so small.

it cools slower in the earth meaning the crystals have more time to form than lava on the surface

d) center of the mid-ocean ridge

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