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: Skin color is another polygenic trait. 
Sentence2: Skin color is influenced by multiple genes.

A: Skin
****
Q: Sentence1: Centrioles come in pairs. 
Sentence2: Something that comes in pairs are organelles involved in cell division.

A: come
****
Q: Sentence1: an automobile engine transforms chemical energy into mechanical energy. 
Sentence2: Marine engines, with very few exceptions, are automobile engines converted to marine use.

A:
automobile
****