Chordates Amphibians, FROGS, need information q:?

chordata is the phylum where animals that have a vertebral column,pharyngeal pouches/gill slits,notochord..animals with vertebral column..human in class mammalia,lizards and snake in the class reptila,hagfish in the class myxini...frogs defend mainly in their poison gland located in their back.while toad in the parotid gland.they capture food by projecting their tongue,jumping,can absorb O2 in the H2O by their skin..frogs live in various places mainly in moist or watery in environment