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: An organism can gain energy by assimilation or absorption of food. 
Sentence2: Organisms require food for growth.

SOLUTION: food

PROBLEM: Sentence1: Pedigree A pedigree is a map of the types of hemoglobin in the family tree. 
Sentence2: a map of the types of hemoglobin in the family tree is a useful tool for studying inheritance patterns.

SOLUTION: family

PROBLEM: Sentence1: Fiber optics works by carrying light along hair-thin filaments of glass. 
Sentence2: an incandescent light bulb converts electricity into light by sending electricity through hair-thin fibers of glass.

SOLUTION:
Fiber