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keep your tank of water in a nice clean and safe place.... also..... keep it sealed....
-species varieties -genotypes -environmental factors
Water and Rock
light and water and temp.
Elevation, latitude, proximity to water
because im handsome
Deep ocean currents are caused by differences in saltiness or water temperature.
Oxygen
Temperature, latitude, ocean currents, glacier( pure water) etc are the factors affecting salinity difference..
basically everytghing considering how the weather acts and how the water cycle is in rotation
climatestandard of livingextent of sewragemeeeringcost of waterwater qualitysize of citypopulationindustries
This depends on many factors.