How Does an Elephant Extend a Proboscis That Has No

Question

How does an elephant extend a proboscis that has no bone structure in it?
A)Muscles forcibly expand
B)The trunk is an empty chamber and water is forced into it
C)The elephant trunk is an example of a muscular hydrostat
D)This is a hydraulic system similar to what was found in echinoderms
E)Antagonistic muscles operate in pairs across flexible cartilage

Accepted Answer

The elephant trunk is an example of a muscular hydrostat, which means that it is made up of muscles that can contract and elongate without any bony support. This allows for extremely flexible movement and manipulation of objects.