Select the invertebrate.

 - jumping spider
 - asp viper
 - sheep
 - harbor seal
Like other spiders, a jumping spider is an invertebrate. It does not have a backbone. It has an exoskeleton.
A sheep is a mammal. Like other mammals, a sheep is a vertebrate. It has a backbone.
An asp viper is a reptile. Like other reptiles, an asp viper is a vertebrate. It has a backbone.
A harbor seal is a mammal. Like other mammals, a harbor seal is a vertebrate. It has a backbone.