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: Mitosis is cell division. 
Sentence2: mitosis often causes growth.
answer:
Mitosis


question:
Sentence1: an animal requires warmth for survival. 
Sentence2: Light and heat and warmth are basic necessities for survival.
answer:
warmth


question:
Sentence1: wind is used for producing electricity. 
Sentence2: Turbines are used to producing electricity.
answer:

electricity