A.when there is low gene flow
Answer:
true
Explanation:
When soils erode, sediments are washed into waterways. Excess sediments can cause damage by blocking light that allows algae (an important food source) to grow, harming fish gills, filling up important habitats, and stopping fish from seeing well enough to move around or feed.
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Spread of disease is the answer.
Disease can cause an epidemic which can lead to mass population decline.
