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: killing microorganisms in food can be used to extend the shelf life of that food. 
Sentence2: Cooking can be used to extend the shelf life of food.
[EX A]: be

[EX Q]: Sentence1: All life relies on a relatively narrow range of pH, or acidity. 
Sentence2: humans rely on a relatively narrow range of acidity.
[EX A]: acidity

[EX Q]: Sentence1: Sperm pass out of the body through the urethra. 
Sentence2: From there, urine is expelled through the urethra and out of the body.
[EX A]:
urethra