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: folding an object causes that object to change shape. 
Sentence2: Folding an object causes that object to transform.
[EX A]: causes

[EX Q]: Sentence1: Mitosis is cell division. 
Sentence2: Chromosomes are the form of the genetic material of a cell during mitosis.
[EX A]: Mitosis

[EX Q]: Sentence1: a flower 's purpose is to produce seeds. 
Sentence2: Planting seeds is a study of seeds and their growth.
[EX A]:
seeds