The correct answer is B. biomagnification.
Biomagnification is the increase in concentration of a substance, such as a pesticide, in an organism as it moves up the food chain. This occurs because organisms at higher trophic levels consume organisms at lower trophic levels, and the substance is passed on to the next level in the food chain. As the substance moves up the food chain, it becomes more concentrated in the tissues of the organisms. This can have harmful effects on the organisms, as well as on the ecosystem as a whole.
A. Bioremediation is the process of using living organisms to clean up pollution. This can be done by using bacteria to break down pollutants, or by using plants to absorb pollutants from the soil.
C. Biological enhancement is the process of using living organisms to improve the environment. This can be done by using plants to improve air quality, or by using fish to control pests.
D. Biopollution is the contamination of the environment by living organisms. This can be caused by the release of harmful chemicals into the environment, or by the introduction of invasive species.