'd like to know what the hell you heard that caused you to make this observation! There's no way copper is going to fill in for carbon in meaningful way in biochemical structures. Carbon is IV A and copper is VIII.

Don't shoot the messenger! I doubted it but I thought maybe someone else here could shed some light. I take it that it's not possible but I'd like to hear arguments to the contrary. Are Cephalopods carbon-based or copper-based?