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: Genetics is the study of inheritance. 
Sentence2: Pedigrees are useful tools for studying genetics.

Answer: Genetics


Question: Sentence1: Nitrogen is found in proteins, nucleic acids, and chlorophyll. 
Sentence2: Nitrogen, as a gas, is colorless, odorless, and a generally inert element.

Answer: Nitrogen


Question: Sentence1: Water is essential for all life on Earth. 
Sentence2: For example, H20 is the molecule of water-made up of two atoms Hydrogen and one atom of Oxygen.

Answer:
Water