Answer:
Please see the answer below.
Explanation:
The worm benefits from the algae because the algae keeps providing food for the worm through continuous photosynthesis.In other words, the algae act as a source of food for the worm and keeps them alive.
The algae on the other hand benefit from the worm by getting adequate sunlight for photosynthesis. Through photosynthesis, algae can obtain all the necessary food for their metabolism. In addition, the algae might gain a kind of protection from predators by sheltering in the skin of the worm.