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: Passive immunity lasts only as long as the antibodies survive in body fluids. 
Sentence2: A pregnant woman will pass antibodies to the fetus.
[A]: antibodies


[Q]: Sentence1: Coral reefs provide food and shelter to many ocean organisms. 
Sentence2: Reef-building corals are hermatypic.
[A]:
Coral