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: hearing is used for sensing sound by animals. 
Sentence2: functioning ears are used for sensing sound by animals.

A: animals
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Q: Sentence1: Genetics is the study and application of principles of inheritance to plants and animals . 
Sentence2: Pedigrees are useful tools for studying Genetics.

A: Genetics
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Q: Sentence1: Ribosomes are sites where proteins are made. 
Sentence2: Biomolecules covered include amino acids, proteins, enzymes, vitamins and hormones.

A:
proteins
****