instruction:
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: camouflage is used for protection by prey against predators. 
Sentence2: blending is used for protection.
answer:
protection


question:
Sentence1: hearing is used for sensing sound by animals. 
Sentence2: functioning ears are used for sensing sound by animals.
answer:
animals


question:
Sentence1: Fossil fuels are coal, oil, and natural gas. 
Sentence2: gases released during the use of coal, oil, and natural gas causes global warming.
answer:

coal