How Does an Elephant Extend a Proboscis That Has No

question 18

Multiple Choice

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

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