dont really know. thats what googles for?
They need to be non-toxic, non-reactive, relatively durable, of known purity, and ease of workability is a bonus too.
co2 and h20
my penis
what geogaphical features are needed when building a hydroelectric dam
urinary blass
Photolysis and Carbon Fixation...
Calcium (milk)
minerals
well cheimicly all i know
organs
minerals
my answer would be elements.