Select the vertebrate.
A: redback spider
B: common octopus
C: birdwing butterfly
D: asp viper
Like other octopuses, a common octopus is an invertebrate. It does not have a backbone. It has a soft body.
Like other spiders, a redback spider is an invertebrate. It does not have a backbone. It has an exoskeleton.
A birdwing butterfly is an insect. Like other insects, a birdwing butterfly is an invertebrate. It does not have a backbone. It has an exoskeleton.
An asp viper is a reptile. Like other reptiles, an asp viper is a vertebrate. It has a backbone.