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: burning fossil fuels increases the carbon in the atmosphere. 
Sentence2: the byproduct of fossil fuels is carbon.

A: carbon
****
Q: Sentence1: Balance is the ability to sense and maintain body position. 
Sentence2: Another part of the inner ear is used for balance.

A: Balance
****
Q: Sentence1: Precipitation falls on the windward side of the mountain range. 
Sentence2: The windiest side of a mountainous peninsula would have the most precipitation.

A:
Precipitation
****