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Horns are growths that protrude from the skulls of some animals. Horns are made of two components: 1) bone and 2) keratin. The bone is the center, or core, of the horn and is fused to the bone of the skull. The bone core is covered by a resilient sheath (protective covering) made of keratin.s already stated horns are permanent growths made of bone and keratin, they do not branch out, and are found on animals belonging to the family Bovidae (Bovids). Nature, however, can be both curious and complicated. In the case of what defines a horn, the American Pronghorn Antelope is an interesting exception.
Science vs Common Sense. Saxophones are mostly made from brass, which is an alloy mostly of copper and zinc. There are and have been slightly different combinations, and various other metals (e.g. lead) also included. Saxophones are also made from other materials, e.g. copper, bronze, silver and plastic. Various finishes are available: different types of lacquer and metal plating, e.g. silver, gold and nickel.