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: cell division often causes growth. 
Sentence2: Mitosis is cell division.
[A]: cell


[Q]: Sentence1: Adaptation traits contribute to individual fitness and to the evolution of animal genetic resources. 
Sentence2: Behaviors can improve the evolution of animal genetic resources.
[A]: animal


[Q]: Sentence1: poison causes harm to living things. 
Sentence2: Most disinfectants contain solvents that can harm living things.
[A]:
harm