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.

[EX Q]: Sentence1: the digestive system breaks food into nutrients for the body. 
Sentence2: Meat is a nutrient-dense food.
[EX A]: food

[EX Q]: Sentence1: a battery converts chemical energy into electrical energy. 
Sentence2: A battery produces a flow of electrons.
[EX A]: battery

[EX Q]: Sentence1: Bivalves feed on plankton and nonliving organic matter. 
Sentence2: Clams and oysters are examples of bivalves.
[EX A]:
Bivalves