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

Answer: protection


Question: Sentence1: Caverns Secrets are hidden in caves. 
Sentence2: hidden caves are formed by carbonic acid in groundwater seeping through rock and dissolving limestone.

Answer: are


Question: Sentence1: Gene cloning is the process of isolating and making copies of a gene. 
Sentence2: Gene cloning permits direct detection of gene mutations.

Answer:
Gene