The internal environment of fresh water fish is:

Explanation

Freshwater fish have an internal environment that is hypertonic compared to the surrounding water. This means that the concentration of solutes inside the fish is higher than that in the freshwater environment. As a result, water tends to enter the fish's body via osmosis, and the fish must actively excrete excess water to maintain homeostasis. The other options are incorrect because:Isotonic: This would imply equal solute concentration inside and outside the fish, which is not true for freshwater fish.Hypotonic: This suggests a lower internal solute concentration compared to the outside, which is incorrect for freshwater fish.None: This option does not accurately describe the relationship between the fish's internal environment and the external freshwater environment.