Eutrophic are waters with a good supply of nutrients and hence a rich organic production. Evaporation is the process of liquid water becoming water vapor, including vaporization from water surfaces, land surfaces, and snow fields, but not from leaf surfaces. Top F Facultative anaerobic bacteria are bacteria that use oxygen when it is available, but are also capable of fermentation. Fecal Coliforms are species of bacteria that are present in the digestive tracts of humans and other warm-blooded animals. These are not disease producers, but great numbers of these bacteria indicate unsanitary conditions where disease-causing organisms may also be present.
Fermentation is the chemical process by which a sugar is turned into an alcohol, releasing energy.
A food chain is a way of showing how nutrients and energy pass from producers through the various trophic levels in an ecosystem at any given time, moving from producers up the food web to top-level consumers. A food web is the integration of many food chains existing in an ecosystem showing the complex, interwoven pathways of energy flow between the organisms living in that environment. Fucoxanthin is a brownish pigment found in diatoms, brown algae and dinoflagellates. Top G Gram-negative bacteria have an outer cell wall consisting of lipopolysaccharides and proteins and do not retain crystal violet stain, but are colored red by the counter stain, safranin. Ground water is water that flows or seeps downward and saturates soil or rock, supplying springs and wells.