You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
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Question: Category: CLASSICAL MYTHOLOGY 
Clue: Some say this underworld canine has serpents entwined around his multiple necks

Answer: cerberus


Question: Category: "E" BAY 
Clue: Thinking green, biologist Ernst Haeckel coined this term for the way animals interact with the environment

Answer: ecology


Question: Category: TEEN MOZART 
Clue: Mozart wrote home that the premiere of "La Finta Giardiniera" was greeted with shouts of this word of acclaim

Answer:
bravo