What two features make hair a good subject for establishing individual identity? To which layer of the hair shaft are much of these features attributed?

Name: What two features make hair a good subject for establishing individual identity? To which layer of the hair shaft are much of these features attributed?
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The Answer of What two features make hair a good subject for establishing individual identity? To which layer of the hair shaft are much of these features attributed?

What Two Features Make Hair a Good Subject for Establishing