Select the vertebrate.

 - banana slug
 - zebra dove
 - lion's mane jellyfish
 - monarch butterfly
A zebra dove is a bird. Like other birds, a zebra dove is a vertebrate. It has a backbone.
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.
Like other slugs, a banana slug is an invertebrate. It does not have a backbone. It has a soft body.
Like other jellyfishes, a lion's mane jellyfish is an invertebrate. It does not have a backbone. It has a soft body.