17.A fresh water organism cannot survive in a water body that have greater ___ than it’s original habitat. A. Nutrient B. Depth C. Salt concentration D. Water clarity
Option C. For aquatic organisms the quality (chemical composition, PH) of water is very important. The salt concentration (measured as salinity in parts per thousand), is less than 5 parts per thousand in inland waters, 30-35 parts per thousand in the sea and more than 100 parts per thousand in some hyper saline lagoons. Many fresh water animals cannot live for long in sea water and vice versa because of the osmotic problems they would face.
