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: DNA is made up of nucleotides. 
Sentence2: Mutations can change the structure of DNA.
[EX A]: DNA

[EX Q]: Sentence1: Many plants respond to the days growing shorter in the fall by going dormant. 
Sentence2: Many plants respond to the autumnal equinox by going dormant.
[EX A]: Many

[EX Q]: Sentence1: Water erosion has similar consequences as wind erosion. 
Sentence2: The power of wind and water can cause a river to deepen and widen.
[EX A]:
Water