All previously discovered living things on earth are classified into five kingdoms under the taxonomical system. For example, all animals belong to Kingdom Animalia, plants belong to Plantae, fungi to Kingdom Fungi, protists to Protista, with bacteria and archaea belonging to their own taxonomic rank known as Kingdom Monera. As bacteria are unicellular prokaryotic entities, they do not have a nucleus or any membrane-bound organelles. … Continue reading Animal that doesn’t need oxygen to survive discovered.