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Yes and No.

It depends on the organism in question. Human teeth are a mixture of metal, being calcium, and minerals in the tissue parts of the tooth. So human teeth have evolved to be quite complex. Some animals, like Nereis worms, a kind of marine polychaete, have a more obvious and simpler metal jaw structure. Nereis metabolise zinc ions to harden their teeth. Other lower taxon groups of animals have proteins like keratin in their jaws, and sometimes with creatures like arthropods, chitin, which is essentially sugars, is metabolised.

So yeah, it depends on the organism. If they're a higher order species it's probably a complex mixture. If they're a lower order something simpler. Mostly organism's structure is taken from their environment - so what they eat and their lifestyles generally leads to what they living structure is made of.

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