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.

[EX Q]: Sentence1: Polygenic inheritance Polygenic traits are controlled by an unknown number of genes. 
Sentence2: Skin color is inherited from a number of genes.
[EX A]: genes

[EX Q]: Sentence1: a flashlight converts chemical energy into light energy. 
Sentence2: Only as long as there are batteries in the flashlight, the flashlight will function.
[EX A]: flashlight

[EX Q]: Sentence1: heat and pressure change the remains of prehistoric living things into natural gas. 
Sentence2: Evidence of prehistoric life includes many dinosaur footprints found in coal mines.
[EX A]:
living