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: creating paper requires cutting down trees. 
Sentence2: Trees begin as epiphytes on host trees.

Answer: trees


Question: Sentence1: Some viruses live in a dormant state inside the body. 
Sentence2: a virus can live in the brain.

Answer: viruses


Question: Sentence1: Heat loss is inhibited by the intense vasoconstriction. 
Sentence2: intense vasoconstriction has a negative impact on an organism.

Answer:
vasoconstriction