Consequences for thermal resistance, evaporative cooling. Capillary action, surface tension. Aquatic organisms can have reduced supporting or structural tissues. Allows easy transport of dissolved materials. Cells can loose water if external environment is hyperosmotic.
Cells gain water if external environment is hypoosmotic.
Bacteria, fungi, plants and many protist cells are surrounded by a strong cell wall that exerts a confining force equal to the osmotic pressure that builds within the cell.