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

SOLUTION: dolphins

PROBLEM: Sentence1: Weather today is said to be sunny and clear. 
Sentence2: High pressure systems cause it to be sunny.

SOLUTION: sunny

PROBLEM: Sentence1: Fertilization occurs when sperm swim to an egg inside an archegonium. 
Sentence2: If fertilized, the egg implants itself in the uterus.

SOLUTION:
Fertilization