Answer:
Hypoxia is believed to be caused primarily by excess nutrients delivered from the Mississippi River in combination with seasonal stratification of Gulf waters. ... Stratification of fresh and saline waters prevents oxygen replenishment by mixing of oxygen-rich surface water with oxygen-depleted bottom water.
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I believe it is <span>Detergents </span>
The best and most correct answer among the choices provided by the question is <span>evolution.
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Evolution is about 65% cause of the natural selection.<span>
Hope my answer would be a great help for you.</span>