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: All of these are ways to stay safe around electricity except (A) staying away from power lines. (B) using cords in good condition. (C) plugging many appliances into one outlet. (D) keeping electricity away from water.?
safe, around, electricity, except

Question: The living things listed below are examples of animals that would be found in what type of ecosystem? anemones, sponges, and squid (A) tundra (B) everglades (C) coral reef (D) fresh water lake?
examples, animals, found, type, ecosystem?

Question: A scientist studies how weathering and erosion can change the shape of a mountain. The scientist needs to collect information over what period of time to gather the most accurate information? (A) days (B) weeks (C) months (D) years?

weathering, erosion, change, shape, mountain., collect, information, period, time, accurate, information?