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.

Ex Input:
Sentence1: Animals behave in a variety of ways which enhance their chances of survival and reproduction.
Sentence2: Animals learn to behave to increase chances of survival.

Ex Output:
behave

Ex Input:
Sentence1: information in an organism 's chromosomes cause genetic traits to be passed down to that organism 's offspring.
Sentence2: information in Man's chromosomes cause genetic traits to be passed down to offspring.

Ex Output:
chromosomes

Ex Input:
Sentence1: Low latitudes, for instance, receive more heat during the day than stations at high latitudes.
Sentence2: Differences in solar warming with latitude during the day on the Earth's surface influence global wind patterns.

Ex Output:
day