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The natural oil on your skin forms on the ridges of skin on your finger pads. This oil is transferred to another object when you touch it, thereby leaving behind an impression of your prints.
Sweat gland.
Dermal papillae
Dogs don't have fingerprints.... however, a dog's nose is made up of the same type of skin (friction skin) and can be used in a similar manner as a human's fingerprints.
Skin is an organ, that contains glands
The oils and dirt on your skin stick to items that you touch. This causes fingerprints to form on most items.
sebaceous gland
Acts as a gland by synthesizing vitamin A.
dermal papillae
a small gland in the skin which secretes a lubricating oily matter (sebum) into the hair follicles to lubricate the skin and hair.
Apocrine glandsebaceous
Oil gland