Which of the following is not a characteristic of the source of rivers and streams?
a. high oxygen levels

b. freshwater fish

c. cooler temperatures

d. murky waters

The option which is not a characteristic of the source of rivers and streams is D. murky waters.
These waters are too fast to be able to allow murky waters - they are usually very clean and good to drink. Other characteristics are high oxygen levels, freshwater fish, and cooler temperatures.