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.
--------
Question: Sentence1: If there is enough moisture in the clouds, rain is produced. 
Sentence2: Clouds lacking water reduces rainfall.

Answer: clouds


Question: Sentence1: camouflage is used for protection by prey against predators. 
Sentence2: blending is used for protection.

Answer: protection


Question: Sentence1: Gene flow occurs when individuals move into or out of a population. 
Sentence2: moving into or out of a population affects traits.

Answer:
population