Some arthropods have special excretory structures.
An arthropod is a member of the phylum arthropoda.
Phylum arthropoda have special excretory structures .
What creatures have special excretory structures.

1) warm-blooded
2) fur seals
3) phylum Cnidaria
4) phylum arthropoda
5) barnacles
6) Phylum Chordata
7) Phylum Mollusca
8) Most plants