Fact 1: Some arthropods have special excretory structures.

Fact 2: Insects are the largest group of arthropods.

Given the two facts above, answer the question "What can have special excretory structures?" with the following options: 
- barnacles
 - animals
 - feces
 - molecules
 - fungi
 - cows
 - insects
 - planets


 

       insects  