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: Ozone depletion results in higher levels of UV radiation reaching Earth. 
Sentence2: less ozone means more ultraviolet light.
[EX A]: Ozone

[EX Q]: Sentence1: cell division often causes growth. 
Sentence2: Cell division leads to reproduction.
[EX A]: cell

[EX Q]: Sentence1: Macroevolution is evolution over geologic time above the level of the species. 
Sentence2: Evolution has occurred over geologic time.
[EX A]:
evolution