An entrance into a cavity or area of space can be found at the opening of the space. Generally, the entrance is the point at which the interior space is accessible from the outside. Examples of entrances to various cavities or spaces can be found in nature, in artificial constructions, and even within the human body.

Examples of Entrances

In nature, entrances to cavities or areas of space can be found in caves, burrows, and hollow trees. A cave is an underground area with a single entrance, such as a hole or fissure in the ground. A burrow is a tunnel-like structure made by animals to provide protection, while a hollow tree has a large opening at the base that allows access to its internal space.

Artificial constructions also have entrances into cavities or spaces, such as doorways, archways, and gates. Examples of entrances to buildings are the doors that allow access to their interiors. Additionally, some types of structures may feature an archway or gate as an entrance. Additionally, these entrances are often decorated with additional ornamentation.

The human body also contains entrances to cavities or spaces. For example, the human mouth provides an entrance to the digestive system, while the nose provides an entrance to the respiratory system. Additionally, the ears provide an entrance to the ear canal and the eyes provide an entrance to the eye sockets.

Conclusion

In summary, an entrance to a cavity or space is the point at which the interior space is accessible from the outside. Examples of entrances to various cavities or spaces can be found in nature, in artificial constructions, and even within the human body. Therefore, the answer to the initial question is simply an entrance.