[Answer] What is a rhino horn made out of?

Step 1 : Introduction to the question "What is a rhino horn made out of?"

...1. Bone 2. Keratin 3. Enamel 4. Chiton

Step 2 : Answer to the question "What is a rhino horn made out of?"

Keratin - The second largest land animal on Earth, the rhinoceros’ horn is one of the most distinctive features of any large mammal. The horn is made of keratin, the same material that hair and fingernails are made of. Rhino horns are prized in many cultures for supposed magical properties, leading to over-hunting of the species, bringing most of the varieties to the verge of extinction. :

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