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.

[EX Q]: Sentence1: Genetics is the study of inheritance. 
Sentence2: Pedigrees are useful tools for studying genetics.
[EX A]: Genetics

[EX Q]: Sentence1: burning fossil fuels increases the carbon in the atmosphere. 
Sentence2: the byproduct of fossil fuels is carbon.
[EX A]: carbon

[EX Q]: Sentence1: Some parasites kill their host, but most do not. 
Sentence2: Parasites get their nutrients from the body they live in.
[EX A]:
parasites