The main thing living there is the coral. The coral is a living organism. There are also many tropical fish and sea turtles and there is even a starfish that eats the coral.
coral reef
Food chain.
They could have slight OCD.
D.O. is what or whom I.O. is to whom or for whom
No, "whom" is used as the object of a verb or preposition in formal English, while "who" is typically used in more informal contexts.
Give the letter to Mary. to whom?The letter is for Mary. for whom?
whom
It is spelt "whom". It is the objective form of "who".
To whom it may concern Who is a subject pronoun; it is used as the subject of a verb. Whom is an object pronoun. If you find you can replace who/whom with he, she, or they, who is correct. If you find you've replaced who/whom with him, her, or them, then whom is correct.
with whom
Whom is translated as "किसे" in Hindi. It is used when referring to the object of a verb in a sentence.
I think the words you are looking for are food chain?