instruction:
You are given an elementary science question along with a few answer options. List all the words from the question that are essential and sufficient for choosing the correct answer option. Keep in mind that essential words are necessary to understand the meaning of the given question. However, non-essential words provide little information needed to select the correct answer. You can think about it like this: If the question was in another language, knowing the meaning of which words were necessary and enough for you to understand the question and answer it?. If your answer consists of multiple spans of words from the question, separate those using a comma (", "). Do not generate any word that is not present in the question. Make sure that your response is contained in the given question and the words are in the same order as the question.
 Grammatical correctness is not important.
question:
Question: During winter months, Amina sometimes notices ice covering the hoods of parked cars. Once the engine of the car runs for a while, the ice on the hood begins to melt. What form of energy is released from the car engine to melt the ice? (A) chemical (B) electrical (C) heat (D) light?
answer:
ice, melt., energy, released, car, engine, melt, ice?


question:
Question: In which example could a thermometer be used to show that heat energy is being transferred? (A) A piano is played by striking the keys. (B) A shovel is used to move dirt from one place to another. (C) A ball is thrown into the air. (D) A stove is used to boil water in a pan.?
answer:
example, thermometer, show, heat, energy, transferred?


question:
Question: A simple food chain includes hawks, lizards, and insects. Which will most likely happen to the lizard and hawk populations if a pesticide is sprayed to kill the insects, and the lizard and hawk populations cannot find other food in this ecosystem? (A) Both the lizard population and the hawk population will increase. (B) Both the lizard population and the hawk population will decrease. (C) The lizard population will increase, but the hawk population will decrease. (D) The lizard population will decrease, but the hawk population will increase.?
answer:

food, chain, insects., happen, lizard, hawk, populations, pesticide, kill, food