Question

question 22 of 34
which sentence best explains eutrophication?
a. bacteria are introduced to break down hydrocarbons in an oil spill.
b. an increased growth in microorganisms results in oxygen depletion.
c. the mercury contained in fish builds up in animals that eat the fish.
d. materials containing metal are toxic to organisms that live in them.

Explanation:

Eutrophication occurs when excessive nutrients cause a rapid growth of microorganisms like algae. As they decompose, oxygen is depleted. Option B describes this process. Option A is bioremediation, Option C is bio - magnification, and Option D is about metal toxicity.

Answer:

B. An increased growth in microorganisms results in oxygen depletion.