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: skin is used for protecting the body from harmful substances. 
Sentence2: Acids are harmful to tissue.

SOLUTION: harmful

PROBLEM: Sentence1: Moisture is required for the microorganisms to grow. 
Sentence2: Moisture can cause infections to grow.

SOLUTION: Moisture

PROBLEM: Sentence1: Skin color is another polygenic trait. 
Sentence2: tourette syndrome is a trait.

SOLUTION:
trait