Which of the following has ear openings?

The presence of ear openings is a distinctive anatomical feature found in reptiles. Unlike amphibians and most insects, reptiles have evolved structures that allow them to hear sounds effectively, including external ear openings. The ear anatomy of reptiles is adapted to better sense vibrations from their environment, which is crucial for both predator evasion and prey detection.

Amphibians possess inner ear structures but generally lack external ear openings, relying mostly on their skin and other sensory adaptations to perceive sound. Insects, while they have various means of sensing vibrations, do not possess ear openings akin to those found in reptiles; their sound detection is typically through specialized body structures. Fish, on the other hand, do not have ear openings in the way reptiles do; they sense sound through the lateral line system and internal structures rather than external ears, which is adapted to their aquatic environment.

Therefore, reptiles stand out as the group characterized by having ear openings, which allows them to detect sounds in their environment more effectively than the other groups listed.