The osmosis is the movement of water in and out of the cell down to the concentration gradient of water through the semi-permeable membrane. The concentration gradient determines the rate of osmosis.
However, osmosis indirectly relies upon factors such as the temperature and the surface area.
Surface area elevation also elevates the rate of osmosis. Similarly, with an increase in temperature, osmosis increase too.
Chitin is a long-chain polymer derived from glucose. It strengthens cell walls of fungi and the outer covering (exoskeleton) of arthropods (including crabs, shrimps, and insects).