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: forming coal requires decaying vegetation. 
Sentence2: Forming fossil fuels requires decaying vegetation.
answer:
decaying


question:
Sentence1: Combustion generates toxic fumes. 
Sentence2: High temperatures can cause toxic fumes.
answer:
fumes


question:
Sentence1: Mollusks are a major food source for other organisms, including humans. 
Sentence2: Seafood, such as mollusks and crustaceans, can be a source of cadmium, as well.
answer:

Mollusks