Metal transport

Edward Lipsett schrieb:
> Are there are chemistry- or physics-related reasons why

I guess that produce metal structures requires too much energy to be
worthwhile for living organisms. Also, many metals oxidize readily, so they
require some kind of coating to stay useable.

IIRC, Ferrite (iron oxide) is occasionally used. One application is in the
magnetic senses of e.g.migratory birds. Another I vaguely remember is in the
teeth of snails on their tongues (radula). However, a quick web search
resulted in several sites that state that these are made of Chitin, so I am
probably wrong on this one.

Greetings