Select the vertebrate.

 - monarch butterfly
 - atlantic salmon
 - red-kneed tarantula
 - hissing cockroach
Like other tarantulas, a red-kneed tarantula is an invertebrate. It does not have a backbone. It has an exoskeleton.
A monarch butterfly is an insect. Like other insects, a monarch butterfly is an invertebrate. It does not have a backbone. It has an exoskeleton.
An atlantic salmon is a fish. Like other fish, an atlantic salmon 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.