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: Dilation occurs when cell walls relax. 
Sentence2: Decreased oxygen levels cause blood vessels to dilate and cell walls to relax.
[EX A]: relax

[EX Q]: Sentence1: Gravity is a force that pulls on things. 
Sentence2: A force that pulls on things pulls objects towards planets.
[EX A]: force

[EX Q]: Sentence1: Scales protect fish from predators and parasites and reduce friction with the water. 
Sentence2: Scales protect fish from predators and parasites and allow them to move faster.
[EX A]:
Scales