Osmosis is a specific type of diffusion which refers to water moving from an area of higher water potential to one of lower water potential across a partially permeable membrane.

Water is a polar molecule and so is able to pass across the lipid bilayer. Osmosis creates a specific pressure known as osmotic pressure. It’s created due to the difference in potentials across the semi-permeable membrane. The pressure causes the water to move from the higher to the lower concentration. When equilibrium is reached the pressure stops. This scenario is known as isotonic: there’s no net movement of water because the concentrations are at equilibrium.

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Temperature

Enzymes have an optimum temperature which is the temperature at which they are most active. This optimum is different depending on the enzyme. In mammals it’s around 40