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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:

Answer:

The oxygen content of rivers and river water sources is higher than the oxygen content of estuaries. As a result, organisms that require more oxygen are more likely to be found at the source of the river, while organisms that require less oxygen are more likely to be found at the mouth of the river.

Explanation:

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