There are two types of waves: mechanical and electromagnetic. Microwaves, infrared waves, and radio waves are examples of electromagnetic waves. Which statement is true about the speed of an electromagnetic wave?

B. Eutrophication occurs when excess nutrients are present in aquatic ecosystems, resulting in the increased production of plant life and the subsequent decrease in the oxygen levels of the water.

Explanation:

Eutrophication, refers to the gradual increase in the concentration of plant nutrients in an aquatic ecosystem that's aging such as a lake.

This then brings about the increased production of plant life and the subsequent decrease in the oxygen levels of the water.

Therefore, the correct option is B.