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: the mass of an object causes the gravitational force exerted by that object. 
Sentence2: gravitational force accelerates objects.
answer:
force


question:
Sentence1: the ovaries are used in reproduction. 
Sentence2: Egg released by the ovary.
answer:
ovaries


question:
Sentence1: Male dogs use pheromones in urine to mark their territory. 
Sentence2: Male dogs use something that attracts females in urine to mark their territory.
answer:

Male