The size of spherical aerobic bacteria is limited by the rate at which oxygen diffuses through water. A bacterium with a radius greater than about 15 µm is not able to obtain enough oxygen from the surrounding water to sustain itself. Given that the diffusion constant of oxygen in water is 12 x 10-10 m2/s, how long does it take oxygen in water to diffuse a diffusion length of 15 µm?
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