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: Distance is measured in meters the SI unit of distance. 
Sentence2: The SI unit of distance is in meters.

SOLUTION: SI

PROBLEM: Sentence1: the Earth being tilted on its rotating axis causes seasons. 
Sentence2: the planet's orbit and tilt causes seasons.

SOLUTION: seasons

PROBLEM: Sentence1: an aquatic animal requires great amounts of water to survive. 
Sentence2: Too much algae can deplete the water of oxygen, making it impossible for aquatic animals to survive.

SOLUTION:
survive