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: __________ are the first source of matter in the food chain. (A) Consumers (B) Decomposers (C) Herbivores (D) Producers?

Answer: first, source, matter, food, chain.


Question: Question: Which of the following is not a component of a reef ecosystem? (A) coral (B) fish (C) sponge (D) crocodile?

Answer: component, reef, ecosystem?


Question: Question: Several tomato plants are grown indoors next to a sunny window. The plants receive water and fertilizer and remain on the windowsill. What will most likely happen? (1) Most of the leaves on the window side will wilt and die. (2) The roots of the plants will grow upward from the soil. (3) Water droplets will collect on the leaves facing away from the window. (4) The stem will bend toward the window.?

Answer:
tomato, plants, indoors, sunny, window., receive, water, fertilizer, likely, happen?