All chemical reactions take place on surfaces = so very important
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For example, the amount of nutrients a cell can absorb are proportional to its surface area.
so it can get more sun
It is not always the case. If you are out in the cold with insufficient clothing, the important thing - to prevent hypothermia - is to MINIMISE the surface to volume ratio.
Fungi make their food via absorption, and a large surface area makes nutrient absorption extremely efficient.
It is the surface area of the two ends plus the surface area of the curved surface. Surface area of each end is pir2 Surface area of the curved surface is 2pirh Total surface area = 2pir2 + 2pirh