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.

[Q]: Sentence1: Marine dolphins are endangered by fishing nets, speedboats, and pollution. 
Sentence2: dolphins live mainly in shallow coastal waters.
[A]: dolphins


[Q]: Sentence1: moss causes chemical weathering. 
Sentence2: Sphagnum moss mixed with peat moss.
[A]: moss


[Q]: Sentence1: Mollusks are a major food source for other organisms, including humans. 
Sentence2: Intervertebrates are a major food source for other organisms, including humans.
[A]:
food