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
****
Q: Sentence1: when a gas in an open container evaporates , that gas spreads out into the air. 
Sentence2: If you place gas in an open box it will evaporate and spread out into the air.

A: gas
****
Q: Sentence1: Mammals that are viviparous are called therian mammals. 
Sentence2: Mammals Mammals are warm-blooded vertebrates.

A:
Mammals
****