Based on scientific research and considering the content of the question, the correct answer is "Fingerprint."
According to a research study supported by the National Forensic Science Technology Center, it has been concluded that no two people share the same fingerprint, including identical twins.
Similarly, individually, we have different fingerprints across our fingers, making it so unique.
Therefore, given that humans are about over 7 billion, with different or unique fingerprints, it is concluded that the answer to the riddle is "fingerprint."
Hence, in this case, it is concluded that the correct answer is "Fingerprint."
Learn more about Fingerprint here: https://brainly.com/question/5628467
