Fact 1: Some arthropods have special excretory structures.

Fact 2: All insects are arthropods.

Given the two facts above, answer the question "What has a special excretory structure?" with the following options: 
- Silk plants.
 - Insects.
 - a fish
 - animals
 - plants
 - Architecture structures.
 - barnacles
 - Corset structure.


 

  Insects.       