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: Centrioles come in pairs. 
Sentence2: Something that comes in pairs are organelles involved in cell division.

A: come
****
Q: Sentence1: moss causes chemical weathering. 
Sentence2: Sphagnum moss mixed with peat moss.

A: moss
****
Q: Sentence1: the ovaries are used in reproduction. 
Sentence2: Ovulation is the release of an egg from an ovary.

A:
ovaries
****