Discussion
Eutrophication in waterbodies is caused by excess
Answer: B
Eutrophication is caused by excess nutrients.
When a lake, pond or coastal water receives too much nitrogen and phosphorus, mainly from fertiliser run-off, sewage and detergents, algae and water plants grow explosively in an algal bloom. When they die, bacteria decomposing them use up the dissolved oxygen, killing fish and other life.
Excess oxygen is the opposite of what happens: eutrophic water ends up starved of oxygen. Salinity and temperature affect aquatic life, but they are not what drives eutrophication.
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