You are presented with the question "Arthropods are the what without a backbone?" and the following answer choices: 
- largest phylum
 - graptolites
 - insects
 - largest mammals
 - largest organs
 - solid, liquid, gas
 - animals
 - largest species

Now knowing that arthropods are the largest phylum of invertebrates and invertebrates are animals without a backbone, choose the best answer.


 

 largest phylum        