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: Chromosomes are the form of the genetic material of a cell during cell division. 
Sentence2: Microtubules move the genetic material of a cell during cell division.

Answer: cell


Question: Sentence1: the ovaries are used in reproduction. 
Sentence2: Egg released by the ovary.

Answer: ovaries


Question: Sentence1: Metal expands when warm and contracts when cool. 
Sentence2: metal contracts when it cools.

Answer:
contracts