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: threatening behavior by predators causes a porcupine to extend its quills. 
Sentence2: Fishers are one of the few specialized predators on porcupines.
answer:
predators


question:
Sentence1: intense heat has a negative impact on an organism. 
Sentence2: intense heat has a negative impact on plants.
answer:
heat


question:
Sentence1: Fog When driving, fog is an obstacle or a hindrance that makes things obscure. 
Sentence2: hindrances to driving are formed by water vapor condensing in the air.
answer:

driving