On 5/13/2014 9:20 PM, Tim wrote:

> Following up on this a little, it might also be interesting to ponder
> why many of Earth's so-called "carbon-based" organisms use various
> calcium, phosphate, and/or protein structures for hard or tough parts,
> and none at all use stronger (and more carbonaceous) diamond or
> carbon-fibre structures.

Isn't it mostly a matter of the energy cost involved in /building/ such
internal structures?  Most organisms are going to go with whatever's
"good enough" for their regular needs, to keep their overall energy
budget/intake within reasonable bounds.

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Kelly St. Clair
xxxxxx@efn.org