hormones and receptors - what came first?

when i read this i wondered the same thing. "which did come first?"
but as you explained now i can understand it.
it's like enzymes: how did the first enzyme form. because enzymes are catalysts heat and time were the only things to help break things down so a structure that could take the place of that catalyst would be very usefull. so early receptors would have reacted to something in the environment and eventually a replacement was produced.but so a glucose molecule, heat, or sumthing like that might wave been the catalysts?and nice neji avatar caligola2