Difference in Phylums?

[LiL Homie]

What are 2 distinctive features that makes the Arthropod phylum different from Annelids,Mollusks, Roundworms,Sponges, Cnidarians, & Flatworms?

*Exoskeletons & a Coelom?

I would appreciate any help. Thanks!

[kjle]

Come on, that's not a tough question. Look in your textbook or google it.

[Dr.Stein]

To answer that, you should understands each characteristics, or at least their special character(s) which cannot find in another ones.

Please write here, then we will guide you further

[satrohraj]

There are many..

1. Exoskeleton
2. jointed legs
3. Tracheal respiration
4. Wide Range of habitats (air+water+land)
etc

[xand_3r]

Other differences include blood composition : annelids have free hemoglobin in their blood, arthropods don't have any pigment in their blood since they have tracheal respiration and the others have hemocyanine as respiratory pigment (also circulating free in the blood).