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: triceps contracting causes a person 's elbow to straighten. 
Sentence2: muscles contracting cause a person's elbow to straighten.

SOLUTION: contracting

PROBLEM: Sentence1: Dilation occurs when cell walls relax. 
Sentence2: Decreased oxygen levels cause blood vessels to dilate and cell walls to relax.

SOLUTION: relax

PROBLEM: Sentence1: Grasses supply most of the food consumed by people worldwide. 
Sentence2: wheat is a plant that is consumed by people worldwide.

SOLUTION:
consumed