You are presented with the question "Most animals without a backbone have what?" and the following answer choices: 
- epidermis and dermis
 - Leptospirosis
 - Veins and arteries.
 - death and devastation
 - scarce resources
 - barks and snarls
 - decreases its bodily water
 - Complex nervous systems

Now knowing that most invertebrates have a more complex nervous system and invertebrates are animals without a backbone, choose the best answer.


 

        Complex nervous systems 