Select the vertebrate.

 - redback spider
 - human
 - grasshopper
 - saturn butterfly
A saturn butterfly is an insect. Like other insects, a saturn butterfly is an invertebrate. It does not have a backbone. It has an exoskeleton.
Like other spiders, a redback spider is an invertebrate. It does not have a backbone. It has an exoskeleton.
A grasshopper is an insect. Like other insects, a grasshopper is an invertebrate. It does not have a backbone. It has an exoskeleton.
A human is a mammal. Like other mammals, a human is a vertebrate. It has a backbone.