Why do human hair and bones are still intack on inert populace?

..while all necessary organs, like the skin are already decomposed. what make it well preserved?

Answer:
Decomposing is done by germs. Hair and bones contain no liquids, so microbes find it very frozen to grow in them, and they do not perish. Even sugar will not be eaten by microbes because of this reason, so it can hold for years.
The cell on the fingernails and in bones go off at a slower rate than those in other organs and tissues
hair as well as nail are made up of the protein keratin.

they are not composed of active cell hence there are no wet or lysosomes(during cell death, lysosomes release enzymes to verbs the cell it is in-acting like a suicide bag)
hence they do not crumble on their own.
furthermore external parasites or decomposers do not find feed material surrounded by them hence theses remain long after annihilation.

bones are made up of a dense matrix of calcium phosphate and other elements-theses also lack lysosomes
they also do not contain feed materials for decomposers .

hence theses remain
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