Snails, beetles, worms, jellyfish, octopuses etc. are animals without backbone. They are called as ____.

Invertebrates are animals that lack a vertebral column (backbone or spine). This group includes diverse animals like snails (mollusks), beetles (arthropods), worms (annelids), jellyfish (cnidarians), and octopuses (mollusks). Vertebrates, like humans, dogs, and birds, have a backbone. The term 'invertebrate' comes from 'in-' meaning 'without' and 'vertebra' meaning 'joint' or 'backbone'.