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: Among families with children the average number of offspring is 1.8. 
Sentence2: information in an organism's chromosomes cause genetic traits to be passed down to that organism's children.
answer:
children


question:
Sentence1: a light bulb is used for seeing in the dark. 
Sentence2: light is required for seeing.
answer:
seeing


question:
Sentence1: fog is formed by water vapor condensing in the air. 
Sentence2: Part of the romance of San Francisco is due to the famous Frisco Fog.
answer:

fog