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: 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.

SOLUTION: behave

PROBLEM: Sentence1: For instance, glucose is a sugar. 
Sentence2: insulin helps cells take up sugar from the blood.

SOLUTION: sugar

PROBLEM: Sentence1: if a living thing becomes too cold then that living thing will die. 
Sentence2: If a living thing gets hypothermia then that living thing will die.

SOLUTION:
die