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

[EX Q]: Sentence1: Boiling water can cause burns. 
Sentence2: heating water can cause burns.
[EX A]: water

[EX Q]: Sentence1: Electron transport is the final stage of aerobic respiration. 
Sentence2: Electron transport involves oxygen.
[EX A]:
Electron