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: All chemical reactions require activation energy to get started. 
Sentence2: Catalysts lower the activation energy.
answer:
activation


question:
Sentence1: a switch is used to start the flow of current in an electrical circuit. 
Sentence2: The flow of electrical current powers a light bulb.
answer:
current


question:
Sentence1: Cells are the microscopic building blocks of organisms. 
Sentence2: Most organisms, including humans produce it.
answer:

organisms