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: sharpening an object causes that object to change shape. 
Sentence2: sharpening a knife causes it to change shape.
[A]: causes


[Q]: Sentence1: Mollusks are a major food source for other organisms, including humans. 
Sentence2: Soft-bodied invertebrates are a major food source for other organisms, including humans.
[A]:
food