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.
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Question: Sentence1: Urine leaves the body through a sphincter in the process of urination. 
Sentence2: urine leaves the body upon relaxation of a muscle.

Answer: Urine


Question: Sentence1: All life relies on a relatively narrow range of pH, or acidity. 
Sentence2: humans rely on a relatively narrow range of acidity.

Answer: acidity


Question: Sentence1: Meiosis is the type of cell division that produces gametes. 
Sentence2: Meiosis, on the other hand, is a two stage process, ultimately producing four cells.

Answer:
Meiosis