Diffusion is movement of particles from an area of high concentration to an area of low concentration. Osmosis is the spontaneous net movement of water across a semipermeable membrane from a region of low solute concentration to a solution with a high solute concentration, down a solute concentration gradient.
This might have an evolutionary advantage as to why the egg behaves such. Presumably, this can help the yolk develop leaving it away from any inconvenient circumstance
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