Copper has an atomic number of 29. That means that there are 29 protons in the nucleus of each copper atom. That's
what the atomic number is: the number of protons in an atom of a certain element.
If one copper atom contains 29 protons, how many copper atoms could you make
out of 58 protons?

Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas