Final answer:
Loop fingerprints are characterized by ridge lines that enter and exit from the same side of the pattern.
Step-by-step explanation:
The class of fingerprints characterized by ridge lines that enter from one side of the pattern and curve around to exit from the same side of the pattern is known as loop fingerprints. Loop fingerprints are one of the three fundamental types of fingerprints, along with arch and whorl patterns.
Loop fingerprints are the most common type of fingerprint pattern, accounting for approximately 60-65% of all fingerprints. They are characterized by a single ridge that enters the pattern from one side, curves around, and exits from the same side.
An example of a loop fingerprint is the radial loop, where the ridge lines enter from the side of the thumb and curve around to exit from the same side.