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.
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Question: Sentence1: Skin color is another polygenic trait. 
Sentence2: Skin color is influenced by multiple genes.

Answer: Skin


Question: Sentence1: an animal requires nutrients to grow and heal. 
Sentence2: Microbes can help an animal to grow and heal.

Answer: grow


Question: Sentence1: a graduated cylinder is used to measure volume of a liquid. 
Sentence2: Water is also a liquid.

Answer:
liquid