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: Specialization occurs when competing species evolve different adaptations. 
Sentence2: evolving different adaptations increases survival.

SOLUTION: adaptations

PROBLEM: Sentence1: a warm front causes cloudy and rainy weather. 
Sentence2: Stratus clouds are associated with a warm front.

SOLUTION: front

PROBLEM: Sentence1: Plants live just about everywhere on Earth. 
Sentence2: Air is everywhere in the earth's atmosphere.

SOLUTION:
Earth