You are presented with the question "How do most analgesics work on invertebrates?" and the following answer choices: 
- insects
 - kinetic
 - adding heat
 - reduce
 - decrease stamina
 - it needs them
 - Relieve pain
 - protect them

Now knowing that most invertebrates have a nervous system and narcotic analgesics act on the central nervous system to relieve pain, choose the best answer.


 

       Relieve pain  