instruction:
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.
question:
Sentence1: Mammalian teeth are important for digestion. 
Sentence2: bats' teeth are important for digestion.
answer:
digestion


question:
Sentence1: If the skin is painful, seek medical attention. 
Sentence2: If your skin hurts, your touch receptors will sense differences.
answer:
skin


question:
Sentence1: looking at bright objects has a negative impact on the eyes. 
Sentence2: Looking at the Sun has a negative impact on eyes.
answer:

eyes