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: Amphibians have permeable skin that easily absorbs substances from the environment. 
Sentence2: permeable skin easily absorbs air to breathe through.

SOLUTION: absorbs

PROBLEM: Sentence1: Marine dolphins are endangered by fishing nets, speedboats, and pollution. 
Sentence2: dolphins live mainly in shallow coastal waters.

SOLUTION: dolphins

PROBLEM: Sentence1: Tobacco is most commonly smoked in cigarettes. 
Sentence2: Lung cancer is most often caused by exposure to cigarettes.

SOLUTION:
cigarettes