Some of the organs they used are :gills and appendices. That was all i can found in internet. I am sorry! But i hope this be useful. (:
they breathe through gills
All arthopods do not have backbones which makes all arthopods invertebrates!
arthopods
Exoskeletons.
the normal ones
Arachnids such as spiders and scorpions have chelicerae.
they are all jointed
Gill
Arachnids, Crustations, Millipedes, Centipedes, Insects
Yes lobsters are invertebrates, as are all Arthopods.
Sponges, Cnidarians, Mollusks, and Echinoderms are not Arthropods.
mollusks and arthopods i very samrt!!
do female arthropods fly