The classification of animals is shown below, where they are divided into Vertebrates and Invertebrates. Warm-Blood and Cold-Blooded animals fall under Vertebrates, like mammals, birds, fish, reptiles, and amphibians. At the same time, legs and without legs come under invertebrates like a worm, fluke worm, tapeworm, leech, spider, cockroach, ladybug, millipede, spider, and others. It should be noted here that in a phylogenetic tree, the characteristics of members of taxa are inherited from previous ancestors. Viruses cannot be included in the tree of life because they do not share characteristics with cells, and no single gene is shared by all viruses or viral lineages.
