What is pH. pH is a measure of the hydorgen ion concentration of a solution. Solutions with a high concentration of hydrogen ions have a low pH and solutions with a low concentrations of H+ ions have a high pH. This may seem like a confusion way to express these reationships, and it is, until you understand what pH stands for.
Because they depend on sunlight for photosynthesis, diatoms generally live in the upper 200 meters of oceans and bodies of fresh water. Some species of diatoms simply float in the water currents near the surface.Others attach themselves to larger floating objects or to the sea floor.ecause they depend on sunlight for photosynthesis, diatoms generally live in the upper 200 meters of oceans and bodies of fresh water. Some species of diatoms simply float in the water currents near the surface.
Some ions and molecules in biological organisms also need to be able to move through tissues, and membranes e.g. cell membranes. They move by the processes of diffusion, osmosis and active transport-of which osmosis is the diffusion of water, an important process in living organisms. 3.he following table lists some of the characteristics of water that explain why water is important for life and for animal biology (including human biology) in particular. The following are listed in no particular order but are numbered for ease of reference: 1.