What mechanism directly causes the decline in oxygen during eutrophication? A_fi

Question

What mechanism directly causes the decline in oxygen during eutrophication?

A_fish coming to feed on the algae and using too much of the oxygen

B-growth in toxic organisms

C-nitrogen and phosphorus runoff

D-decomposition of algae

Why are nonpoint sources becoming a greater problem than point sources of pollution?

A-Regulation is possible only for nonpoint sources.

B-While each nonpoint source releases relatively little pollution, they collectively contribute large amounts of pollutants to the water.

C-Because people can "see" point source pollution, they are more apt to believe and understand that there is a pollution problem

D-Nonpoint sources affect groundwater, whereas point sources affect surface water, and groundwater is more difficult to access and extract.

Explanation / Answer

1) decomposition of algae

Eutrophication is the process of adding extra nutrients like nitrogen and phosphorus to the ocean water vt surface runoff process. This will leads to algal blooms

Whenever the algae dies it decompose and lowers the dissolved oxygen content

2) While each nonpoint source releases relatively little pollution, they collectively contribute large amounts of pollutants to the water

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