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.

Sentence1: Information on DNA is organized into genes. 
Sentence2: DNA codes for proteins.
DNA

Sentence1: All life relies on a relatively narrow range of pH, or acidity. 
Sentence2: humans rely on a relatively narrow range of acidity.
acidity

Sentence1: Skin color is a polygenic trait. 
Sentence2: Polygenic traits are the result of the interaction of several genes.

polygenic