Cyracuz wrote:
Yes, right.
And as rosborne says, there is the sub category of artificial, which basically means man made.
But I wonder, does a birds nest fall under this category? A beaver dam?
Are they natural, or are they artificial constructions?
I guess it would be:
Big Set: Natural
Sub-set: Artificial (made by life)
Sub-Sub-set: Man made, Beaver made, Bird made, Worm made (Caddis Fly shells), Polyp made (Coral), Bacteria made (Stromatolites), etc
It's starting to look like a cladogram
We might have to start figuring out where crystal structures fit into that nomenclature.