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: Flies are insects with two wings. 
Sentence2: Flies are arthropods with two wings.
answer:
Flies


question:
Sentence1: Metabolic rate is the rate at which food is burned for energy. 
Sentence2: thyroid hormones increase the rate of energy consumption.
answer:
energy


question:
Sentence1: When chemical bonds are broken by animals the energy is released in the form of work and heat. 
Sentence2: Chemical bonds are converted to mechanical energy when a creature moves.
answer:

bonds