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: hiding can be used for avoiding predators. 
Sentence2: Camouflage is used for avoiding predators.
[EX A]: avoiding

[EX Q]: Sentence1: Skin color is another polygenic trait. 
Sentence2: Skin color is influenced by multiple genes.
[EX A]: Skin

[EX Q]: Sentence1: Mutualism is a symbiotic relationship in which both species benefit. 
Sentence2: Mutualism is an association between two different species which benefits each species.
[EX A]:
Mutualism