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: bacteria cause food to spoil. 
Sentence2: Food poisoning occurs when spoiled food is eaten.
answer:
spoil


question:
Sentence1: condensing causes a liquid to form. 
Sentence2: Air carries moisture that causes a liquid to form.
answer:
causes


question:
Sentence1: Constriction occurs when the muscular walls of blood vessels contract. 
Sentence2: Constriction happens when the muscular walls of arteries and veins contract.
answer:

Constriction