The largest organism.
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If the surface area of the organism is small, then there is no problem with getting all the oxygen needed. If the surface area of the organism is large, therefore a special respiratory surface is needed. An example is lungs, gills. The ratio of surface area to volume in a small organism is greater than the ratio in a large organism.
hippopatamus
To obtain the ratio of surface area to volume, divide the surface area by the volume.
to obtain the ratio of surface area to volume, divide the surface area by the volume.
0.6 is the surface area to volume ratio.