Fish has a backbone.
Explanation:
Organisms that possess vertebra are called vertebrates and the organisms that don’t are called invertebrates. Fishes belong to the kingdom Animalia and subphylum veretebrata the characteristic feature of which is the presence of backbone.
Jellyfish belongs to the kingdom Animalia and belongs to the phylum cnidaria. Grasshopper belongs to the kingdom Animalia and phylum Arthropoda which includes all insects. Octopus belongs to the kingdom Animalia and phylum mollusca.
