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.

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

A: Genetics
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Q: Sentence1: camouflage is used for protection by prey against predators. 
Sentence2: blending is used for protection.

A: protection
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Q: Sentence1: Birds, like all living things, have intrinsic value. 
Sentence2: poison causes harm to birds.

A:
Birds
****