In what way does the algae relate to the ecosystem of the Coral reef. algae is ___

The corals and algae have a mutualistic relationship. The coral provides the algae with a protected environment and compounds they need for photosynthesis. In return, the algae produce oxygen and help the coral to remove wastes.

Explanation:

3rd person, because the narrator is out of the story but explains the feeling of the main character

is it "means of nourishment"