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: Mollusks live in most terrestrial, freshwater, and marine habitats. 
Sentence2: Clams live in freshwater habitats.
[EX A]: freshwater

[EX Q]: Sentence1: Polyps usually reproduce asexually. 
Sentence2: Polyps usually reproduce several different ways.
[EX A]: Polyps

[EX Q]: Sentence1: Copper is an essential mineral. 
Sentence2: Copper is a chemical element that is essential for body processes.
[EX A]:
Copper