instruction:
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.
question:
Sentence1: skin is used for protecting the body from harmful substances. 
Sentence2: Acids are harmful to tissue.
answer:
harmful


question:
Sentence1: Damage is intensified by moisture stress during drought. 
Sentence2: low amounts of rainfall intensify damage during drought.
answer:
Damage


question:
Sentence1: Mutations may change the structure of a chromosome or just change a single nucleotide. 
Sentence2: Mutations can be detected by analysis on gene abnormalities.
answer:

Mutations