Write a correct answer to the given question based on its associated fact. Make sure that your answer is contained in the associated fact. Don't be creative and introduce any new word that is not mentioned in the associated fact! Remember that the associated fact has been rearranged to form the question. So, the correct answer words must lie within the associated fact. The correct answer can be a word, phrase, or even a sentence.

Fact: Algae play significant roles as producers oceans. 
Question: In the ocean, algae play a significant role as what?
producers.

Fact: Tropical cyclones convert heat energy into mechanical energy. 
Question: What converts heat energy into mechanical energy?
tropical cyclones.

Fact: When an electrical circuit is working properly, computers run. 
Question: Computers run when what is working properly?

electrical circuit.