You work for a wastewater treatment plant whose effluent (outflow) is released into a river that empties into the Chesapeake Bay. You are informed of the dead zone in the bay and are instructed to take measures to remedy the problem. Which of the following steps would be most effective?
Run the purified wastewater through a system that contains denitrifying bacteria.

humans can cause extinction of a species through overharvesting, pollution, habitat destruction, introduction of invasive species (such as new predators and food competitors), overhunting, and other influences. explosive, unsustainable human population growth is an essential cause of the extinction crisis.

explanation:

i didn't have the answer choices , but i tried my best.

what are the options