The 3 types of cephalopods is octopus squid and nautilus and the 3 types of bivalves is gastropods bivalves and cephalopods
1)Carbon
2)Hydrogen
3)Nitrogen
4)Oxygen
5)Phosphorus
6)Sulfur
i think the most logical is A
because antibiotic resistant occurs when bacteria change in some way that reduces or eliminates the effectiveness of drugs, chemicals, etc