A freshwater organism cannot survive in a water body that has greater _____than its original habitat.

Options

A. oxygen content
B. depth
C. salt concentration
D. water clarity

Answer

C

Explanation

For aquatic organisms the quality (chemical composition, pH) of water is very importat. 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 hypersaline lagoons. Many fresh water animals cannot live for long in sea water and vica versa because of the osmotic problems they would face.