What is the most likely function of this structure?
A. To move around
B. To see the outside world
C. To provide protection
D. To hear the outside world
![What is the most likely function of this structure A To move around B To see the outside world C To provide protection D To hear the outside world class=](https://us-static.z-dn.net/files/df6/396f6dbe11cd76aeceacf0266e67e579.png)