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: cell division often causes growth. 
Sentence2: Cell division leads to reproduction.
[EX A]: cell

[EX Q]: Sentence1: Polyps usually reproduce asexually. 
Sentence2: Polyps usually reproduce several different ways.
[EX A]: Polyps

[EX Q]: Sentence1: friction causes an object to lose energy. 
Sentence2: Objects An object can be one of several things.
[EX A]:
object