instruction:
Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.
question:
Sentence1: Nitrogen is found in proteins, nucleic acids, and chlorophyll. 
Sentence2: Life without protein is impossible.
answer:
proteins


question:
Sentence1: keeping food cold is used for keeping food fresh. 
Sentence2: Keeping food cold is used to keep food simple and natural as possible.
answer:
cold


question:
Sentence1: if a habitat can no longer support animals then those animals will move to another area. 
Sentence2: if a habitat can no longer support animals then they will not be able to eat plants or other animals.
answer:

habitat