You are presented with the question "What creatures have special excretory structures." and the following answer choices: 
- warm-blooded
 - fur seals
 - phylum Cnidaria
 - phylum arthropoda
 - barnacles
 - Phylum Chordata
 - Phylum Mollusca
 - Most plants

Now knowing that some arthropods have special excretory structures and an arthropod is a member of the Phylum Arthropoda, choose the best answer.


 

    phylum arthropoda     