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A researcher notices a decline in organism and population numbers over several years in a stream environment. What human activity may have affected organisms and populations in …

A researcher notices a decline in organism and population numbers over several years in a stream environment. What human activity may have affected organisms and populations in …
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A researcher notices a decline in organism and population numbers over several years in a stream environment. What human activity may have affected organisms and populations in this way?

User YourHelper
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Probably over-fishing so the organisms dont have enough food to eat. 
User Gedamial
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