Which term best describes the effect of algal blooms?

helpful

damaging

harmless

neutral

Damaging.

Explanation:

Algal bloom is the growth and increase in algae population in water thereby leading to change in water colour. Their rapid growth is due to high concentration of nutrients in water, which enhance their increased growth.

Algal bloom is damaging because the algae release toxins in water thereby by leading water discoloration and odor. They can use up oxygen in water thereby leading to death of fishes.