Definition: 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.
Input: Sentence1: Serious questions remain regarding what happens if endangered populations continue to decrease. 
Sentence2: harming an animal species causes that animal's species to become endangered.

endangered