Answer: The oxygen content at the source of the streams or rivers is higher as compared to the mouth of the river. Consequently, the organisms which require more oxygen tend to find at the source of the rivers whereas the organisms which require less oxygen tend to find at the mouth of the river.
Explanation:
B the higher the number the colder it is because it is away from the eqator
Answer:
I believe the answer is Dissolved Oxygen.
Explanation:
Dissolved oxygen (DO) is the amount of oxygen that is present in water.
