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.

[Q]: Sentence1: Specialization decreases mortality 12,13 and increases survival. 
Sentence2: evolving different adaptations increases survival.
[A]: increases


[Q]: Sentence1: a rainbow is formed by refraction of light by separating light into all different colors. 
Sentence2: Rainbows form when raindrops refract sunlight.
[A]: refraction


[Q]: Sentence1: Absorption of nutrients occurs mainly in the small intestine. 
Sentence2: Absorption of magnesium occurs in the GI tract.
[A]:
Absorption