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: Bees feed on nectar and pollen. 
Sentence2: Plant reproduction often requires bees and nectar.

SOLUTION: Bees

PROBLEM: Sentence1: Absorption of nutrients occurs mainly in the small intestine. 
Sentence2: The small intestine is the main place where food absorption occurs.

SOLUTION: intestine

PROBLEM: Sentence1: Then dawn breaks and with it comes daylight, illumined by the sun. 
Sentence2: when the seasons change from summer to fall, the amount illumined by the sun will decrease.

SOLUTION:
illumined