TASK DEFINITION: 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.
PROBLEM: Question: Students are learning about the natural resources in Maryland. One group of students researches information about renewable natural resources in the state. The other group researches information about nonrenewable natural resources in the state. The resources the students investigate include plants, animals, soil, minerals, water, coal, and oil. Which nonrenewable natural resource heats homes? (A) sunlight (B) aluminum (C) natural gas (D) ocean waves?

SOLUTION: nonrenewable, natural, resource, heats, homes?

PROBLEM: Question: When a tadpole grows, its gills change into lungs. What does it now need to survive? (A) Air (B) Water (C) Soil (D) Fins?

SOLUTION: gills, change, lungs., need, survive?

PROBLEM: Question: All of these are examples of the ways Earth and the Moon interact except (A) the phases of the Moon. (B) the tides on Earth. (C) seasons on Earth. (D) lunar eclipses.?

SOLUTION:
Earth, Moon, interact