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Q&A Why would a species of subterreanean worms consume metal?

In my latest draft, a worm-like species buries itself deep below the crust of their world and consumes/gathers tiny amounts of heavy metals. Can you think of any plausible reason why a wormlike cr...

7 answers  ·  posted 8y ago by System‭  ·  last activity 7y ago by System‭