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: Leeches are external parasites. 
Sentence2: Leeches live on the surface of their hosts.
answer:
Leeches


question:
Sentence1: Temperature Scales Temperature is the energy of vibration. 
Sentence2: a thermometer is used to measure energy of vibration.
answer:
energy


question:
Sentence1: Animals are heterotrophs, or other-feeders. 
Sentence2: Animals get food by eating other living things.
answer:

Animals