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: riding a bike does not cause pollution. 
Sentence2: riding a bike does not release particles.

Answer: bike


Question: Sentence1: Faster metabolism means more calories consumed, and usually, weight loss. 
Sentence2: mammals generate heat by consuming calories.

Answer: calories


Question: Sentence1: Mollusks are a major food source for other organisms, including humans. 
Sentence2: Many organisms are omnivores with variable diets.

Answer:
organisms