Answer:
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Step-by-step explanation:
The skeletal structure of an organic compound is the series of atoms bonded together that form the essential structure of the compound. The skeleton can consist of chains, branches and/or rings of bonded atoms. Skeletal atoms other than carbon or hydrogen are called heteroatoms(Wikipedia).
Skeletal structures often involve only lines that represent carbon atoms. Hetero-atoms are often shown explicitly in skeletal structures. The skeletal structure of 7-tert-Butyl-3,5-diethyldecane has been shown in the image attached to this answer.