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: moss causes chemical weathering. 
Sentence2: If the moss was completely dried then it is dead.
answer:
moss


question:
Sentence1: Gravity is a force that pulls on things. 
Sentence2: A force that pulls on things pulls objects towards planets.
answer:
force


question:
Sentence1: Fertilization occurs when sperm swim to an egg inside an archegonium. 
Sentence2: Pregnancy begins with a fertilized egg.
answer:

Fertilization