Select the vertebrate.

 - comet moth
 - orb weaver
 - carp
 - earthworm
Like other spiders, an orb weaver is an invertebrate. It does not have a backbone. It has an exoskeleton.
A carp is a fish. Like other fish, a carp is a vertebrate. It has a backbone.
An earthworm is a worm. Like other worms, an earthworm is an invertebrate. It does not have a backbone. It has a soft body.
A comet moth is an insect. Like other insects, a comet moth is an invertebrate. It does not have a backbone. It has an exoskeleton.