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: Muscles can only contract. 
Sentence2: Contraction is a type of movement.
answer:
contract


question:
Sentence1: microbial fuel cells convert chemical energy into electrical energy. 
Sentence2: microbial fuel cells convert chemical energy into kinetic energy.
answer:
cells


question:
Sentence1: Many nucleotides bind together to form a chain called a polynucleotide. 
Sentence2: RNA like DNA is a polynucleotide.
answer:

polynucleotide