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: Sperm pass out of the body through the urethra. 
Sentence2: Sperm travel from the testicles through the vas deferens to the seminal vesicles and the prostate.
answer:
Sperm


question:
Sentence1: chemical splashing can cause harm to humans. 
Sentence2: chemical splashing can cause harm to animals.
answer:
cause


question:
Sentence1: unequal heating of Earth 's surface by the Sun causes global wind patterns. 
Sentence2: Unequal absorption of radiation causes unequal heating of the earth's surface.
answer:

Earth