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.
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Question: Question: Which lists the correct order of changes that happen to a plant in spring? (A) Buds form, flowers open, fruits grow (B) Flowers die, fruits grow, buds form (C) Seeds drop, flowers open, buds form (D) Seeds drop, flowers die, fruits grow?

Answer: correct, order, changes, plant, spring?


Question: Question: Sometimes, species of plants or animals are introduced into an ecosystem where they would not normally live. What is one harmful effect that a new species might have on the balance of an ecosystem? (A) It can coexist and eventually adapt into a similar species. (B) It competes for the mates of the native species. (C) It can poison the soil and kill all the native species. (D) It can crowd out native species since it has no natural enemies.?

Answer: harmful, effect, new, species, ecosystem?


Question: Question: On a warm sunny afternoon, ocean water splashed onto a rock. A short time later, the rock was dry. Which statement best explains what happened to the water on the rock? (A) Heat caused the water to become a gas. (B) Heat melted the water and it disappeared. (C) Salt caused the water to become a gas. (D) Salt melted the water and it disappeared.?

Answer:
sunny, water, splashed, rock., rock, dry., happened, water