TASK DEFINITION: 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.
PROBLEM: Sentence1: DNA is made up of nucleotides. 
Sentence2: Mutations can change the structure of DNA.

SOLUTION: DNA

PROBLEM: Sentence1: Ribosomes are small organelles where proteins are made. 
Sentence2: Ribosomes are assembled inside the nucleus.

SOLUTION: Ribosomes

PROBLEM: Sentence1: Chromosomes are coiled structures made of DNA and proteins. 
Sentence2: Genes are a part of coiled structures made of DNA and proteins.

SOLUTION:
DNA