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: if an animal lives under ground then that animal will be protected from a wild fire. 
Sentence2: animals that live under ground in California will be protected from some natural disasters.

Answer: animal


Question: Sentence1: Insects spread disease and destroy crops. 
Sentence2: Crops are plants that are grown for food or other uses.

Answer: crops


Question: Sentence1: Hagfish are noted for secreting large amounts of thick, slimy mucus. 
Sentence2: Bacteria then thrive in the thick, sticky mucus.

Answer:
thick