Which of the following has the greatest influence on the distribution of animals in marine and fresh water habitats?
pH
Salinity
Water current
Turbidity
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Salinity is the accumulation of salt in land and water to a level that damages the natural and built environment. Many parts of the Australian landscape are naturally salty but human activities can cause salt levels to rise. Salinity and water are inextricably linked.
salinity has a greater influence on the distribution of animals in marine and freshwater habitats. Here's why:
1. Salinity Directly Affects Osmoregulation
Freshwater animals cannot survive in saltwater because their bodies are adapted to low salinity.
pH has the greates influence on Living things
because, liging things are HIGHLY SENSITIVE TO pH ... making A correct 
Freshwater Mollusc are usually absent in water with a pH less than 6....
References Modern Biology
