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: All monkeys are mammals. 
Sentence2: monkeys conserve body heat with their hair or fur.
[A]: monkeys


[Q]: Sentence1: condensation is when change from a gas into a liquid by reducing heat energy. 
Sentence2: Condensation is water from the air.
[A]:
condensation