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: Information on DNA is organized into genes. 
Sentence2: DNA codes for proteins.

A: DNA
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Q: Sentence1: if soil is permeable then water easily flows through that soil. 
Sentence2: The increase in permeability is caused by the formation and expansion of ice in the soil.

A: permeable
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Q: Sentence1: gases released during the use of fossil fuels causes global warming. 
Sentence2: Sulfur dioxide is released during fossil fuel combustion.

A:
fossil
****