How can loop fingerprints be described?

Loop fingerprints can be described as having ridges that enter from one side of the print, curve around near the center, and exit on the same side. This characteristic creates a recognizable pattern where the ridges do not form a complete circuit but instead flow with a distinct curve, unlike other types of fingerprints. The defining feature of loops is their symmetrical nature, where the ridges create a flowing motion in a single direction, emphasizing their entry and exit on the same side.

The other descriptions do not accurately capture the essence of loop fingerprints; straight ridges that cross from one side to the other describe arches, while a complete circle with no exits aligns with whorls. Random squiggles do not represent any standard fingerprint classification. Therefore, the specific behavior of loop ridges as they enter, curve, and exit on the same side makes this option the correct choice.