TASK DEFINITION: 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.
PROBLEM: Sentence1: a polar bear requires a cold environment. 
Sentence2: polar bears live where there are fewer animals.

SOLUTION: bear

PROBLEM: 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.

SOLUTION: children

PROBLEM: Sentence1: To the west is the Pacific Ocean. 
Sentence2: the gravitational pull of the Moon on the Pacific causes the tides.

SOLUTION:
Pacific