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You protect your fingerprints by putting hand cream on them.
You should not let people take a picture of your fingerprints because then they can blow it up and use it.

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How many different  fingerprints  in the world?

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How many different  fingerprints  in the world?

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Fingerprints are patterns on the tip of your fingers. Fingerprints are formed in the womb in the first trimester.  Nobody has the same fingerprints. Fingerprints are friction ridges raised on the epidermis. There are 8 different fingerprints in the world.
https://www.scientificamerican.com/article/lose-your-fingerprints/
http://www.touchngoid.com/8-common-fingerprint-patterns/
https://science.howstuffworks.com/fingerprinting1.htm

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Yes, you can lose your fingerprints through heat or chemicals. It can cause scarring on the epidermis. Fingerprints never change and are permanent from when you are born. When you get older your elasticity of your skin changes with your age so fingerprints are hard to see.
http://sciencemags.blogspot.com/2011/03/can-people-ever-lose-their-fingerprints.html
https://www.scienceabc.com/humans/fingerprints-unique-change-age-alter-crime-diseases-identification-biometrics.html

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You can find fingerprints with a method called forensic science. Your fingerprints can be easily seen on glass or metal. You can see the fingerprints because the ridges have pores that are connected to sweat glands in the dermis. You can find fingerprints by using black paper, tape,and white powder chalk.
https://en.wikipedia.org/wiki/Fingerprint
https://science.howstuffworks.com/fingerprinting1.htm

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What happens when you burn your fingerprints?  

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What happens when you burn your fingerprints?  

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When you burn your fingerprint with acid, your fingerprint can be permanently gone. If you cut or burn your epidermis your fingerprints will grow back the same, but if the cut or burn is deep in the dermis it will not grow back the same and may have scars.
https://en.wikipedia.org/wiki/Fingerprint#Absence_or_mutilation_of_fingerprints
https://www.scientificamerican.com/article/lose-your-fingerprints/