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: Coral reefs provide food and shelter to many ocean organisms. 
Sentence2: Coral Reefs Coral reefs are threatened.

SOLUTION: Coral

PROBLEM: Sentence1: Stress is the applied force, strain is the change in shape. 
Sentence2: Paper is crumbled when stress and strain is applied in order to change the shape.

SOLUTION: Stress

PROBLEM: Sentence1: Fingernails prevent injury by forming protective plates over the ends of the fingers. 
Sentence2: A hard, curved plate of keratin prevents injury to the ends of extremities.

SOLUTION:
ends