Due to decreased light penetration, which area of rivers and steams will have less diversity of plant life

Assuming this is the question that has the four different possible answers, the answer is in fact B: The mouth. Otherwise, I would just say that Any area with said decreased light penetration is going to have less diversity of plant life.

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one of the most common forms of pain or discomfort we feel during strenuous exercise is a burning sensation in our lungs or muscles that goes away shortly after we cease the activity. this is caused by a build-up of lactic acid.

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