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.
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Question: Sentence1: intense heat has a negative impact on an organism. 
Sentence2: intense heat has a negative impact on plants.

Answer: heat


Question: Sentence1: sharpening an object causes that object to change shape. 
Sentence2: sharpening a knife causes it to change shape.

Answer: causes


Question: Sentence1: Chemotherapy works on cells that are dividing. 
Sentence2: Cancer is a disease which cells split and Chemotherapy stops those cells multiplying.

Answer:
Chemotherapy