Question

which impurity in fossil fuels can bioaccumulate and cause harm in aquatic systems? ozone oxygen helium mercury

Explanation:

Ozone is a gas in the atmosphere, oxygen is essential for aquatic life, and helium is an inert gas. Mercury is a heavy metal impurity in some fossil fuels. It can bioaccumulate in aquatic organisms (like fish) through the food chain, leading to harm in aquatic systems.

Answer:

D. mercury