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Neither. The term "vertebrate" is limited in use to classifying animals (which cacti are NOT).
Despite the fact that cacti have "spines" they are not the type of spines that are used to define vertebrates.
The spines that cacti have are spinose structures (sometimes called spinose teeth or spinose apical processes) - are hard, rigid extensions from areoles (small light- to dark-colored bumps) on cactus surfaces.
Vertebrates are defined as having a spinal cord - a long, thin, tubular bundle of nerves and support tissues. Obviously the spines on cacti are not the same thing as spines in animals and are related only in their etymology - that is, they both derive from the Old French term espine.
In all fairness a backbone does bear some resemblance to a thorny stick with all the protrusions coming of of it.
A cactus is neither a vertebrate nor an invertebrate. Only members of the Kingdom Animalia can be classed as vertebrates or invertebrates, and the cactus is not part of that kingdom. Being a plant, it is a member of the Kingdom Plantae.
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