Select the vertebrate.

 - European green toad
 - grasshopper
 - luna moth
 - castor bean tick
A grasshopper is an insect. Like other insects, a grasshopper is an invertebrate. It does not have a backbone. It has an exoskeleton.
A European green toad is an amphibian. Like other amphibians, a European green toad is a vertebrate. It has a backbone.
A castor bean tick is an insect. Like other insects, a castor bean tick is an invertebrate. It does not have a backbone. It has an exoskeleton.
A luna moth is an insect. Like other insects, a luna moth is an invertebrate. It does not have a backbone. It has an exoskeleton.