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: Cultivation is easier if soil is loose. 
Sentence2: soil with more oxygen is easier to cultivate.

SOLUTION: Cultivation

PROBLEM: Sentence1: killing microorganisms in food can be used to extend the shelf life of that food. 
Sentence2: Cooking can be used to extend the shelf life of food.

SOLUTION: be

PROBLEM: Sentence1: Hagfish are noted for secreting large amounts of thick, slimy mucus. 
Sentence2: Extra mucus clogs the airways.

SOLUTION:
mucus