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_____ is an overabundance of nutrients that leads to excessive plant growth and reduction of oxygen in an ecosystem.

denitrification

eutrophication

nitrification

phosphorylation

Verified Answer :

eutrophication, is the best answer.

eutrophication is the excess of salts in the sea water leading to excess growth of algae. this blocks sunlight from reaching other plants so they die. bacteria comes to eat the dead organisms reducing oxygen supply in the sea so there is demand.