Select the vertebrate.

 - hissing cockroach
 - mosquito
 - forest scorpion
 - cardinalfish
A mosquito is an insect. Like other insects, a mosquito is an invertebrate. It does not have a backbone. It has an exoskeleton.
Like other scorpions, a forest scorpion is an invertebrate. It does not have a backbone. It has an exoskeleton.
A cardinalfish is a fish. Like other fish, a cardinalfish is a vertebrate. It has a backbone.
A hissing cockroach is an insect. Like other insects, a hissing cockroach is an invertebrate. It does not have a backbone. It has an exoskeleton.