Advantages of attached algae

Algae is a non flowering plant and found in very most and wet areas.

The Importance of algae include mopping up of the Carbon dioxide present in waterbodies and producing some amount of oxygen to the water through photosynthesis and this helps in the survival of sea animals.

It also helps in pollution control and degradation of hard toxic substances.

They also serve as source of food of sea animals.

i think the answer is b.