Which of the following factors is LEAST likely to affect the animals living in a fresh water habitat?

Salinity is the least likely factor to affect animals living in a freshwater habitat. Salinity refers to the concentration of dissolved salts in water, and since freshwater habitats have low salt concentration, the animals that live there have adapted to these conditions. On the other hand, turbidity, temperature, and pH are all important factors that can affect the health and survival of animals in freshwater habitats. Turbidity, for instance, can reduce the amount of light that penetrates the water, affecting the growth of aquatic plants and the ability of animals to find food. Temperature and pH, on the other hand, can affect the metabolic processes of aquatic organisms, and extreme variations in these factors can be harmful or even lethal to some species.