Final answer:
Friction ridges on fingers and toes, formed by dermal papillae, create unique fingerprints used for forensic analysis.
Explanation:
Friction ridges on fingers and toes that form fingerprints are caused by the dermal papillae in the dermis layer of the skin. These ridges are unique to each individual and are used for forensic analysis due to their consistency. The oily substance secreted by sebaceous glands waterproofs the skin and hair, contributing to the oily appearance of fingerprints.
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