D.O.:Oxygen dissolved into the water.

pH: Tells weather the water is more acid-like or more alkaline, the science term is "OH"(negative hydroxide)plus "O"(positive hydrogen)equals a pH number.

Phyotoplankton:Small life forms that create over three-fourths the world's oxygen.

Positive hydrogen:One of the two chemacals that make pH,the science term is "O".

Negative hydroxidxe:One of the two chemacals that make pH,the science term is "OH".

Photosynthisis:The process of plants changing the suns rays of light into D.O.