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: Bivalves feed on plankton and nonliving organic matter. 
Sentence2: Clams feed on plankton and nonliving organic matter.

Answer: feed


Question: Sentence1: Mammals that are viviparous are called therian mammals. 
Sentence2: Mouse-sized viviparous mammals evolved by Jurassic times.

Answer: Mammals


Question: Sentence1: Deadly carbon monoxide gas from the generator s exhaust can spread throughout enclosed spaces. 
Sentence2: carbon monoxide gas from a generator's exhaust has been evaporated.

Answer:
carbon