What Is It? #16

This month's mystery object is a small fragment of a much larger specimen. Can you guess what it is?

A. Bone from the nasal passage of a wolf

B. Endoskeleton of a sea urchin

C. Nanofabricated anti-corrosion coating for an airplane wing

D. Charcoal from a prehistoric archaeological site

E. "Rusticle" from the hull of the Titanic

You can also visit this page to see the object from all sides in a 360 degree animation.