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are the most evdsed animals amore
vertebrates.
Answers
Answer:
Most species of lungless salamanders (family Plethodontidae), the largest salamander family , ... In some areas of the world, dogs are used as guards or beasts of burden or even for food,
Answer:
Vertebrates (/ˈvɜːrtəˌbrəts/) comprise all species of animals within the subphylum Vertebrata (/-ə/) (chordates with backbones). Vertebrates represent the overwhelming majority of the phylum Chordata, with currently about 69,963 species described.[4] Vertebrates include such groups as the following:
jawless fishes
jawed vertebrates, which include the cartilaginous fishes (sharks, rays, and ratfish)
tetrapods, which include amphibians, reptiles, birds and mammals
bony fishesExtant vertebrates range in size from the frog species Paedophryne amauensis, at as little as 7.7 mm (0.30 in), to the blue whale, at up to 33 m (108 ft). Vertebrates make up less than five percent of all described animal species; the rest are invertebrates, which lack vertebral columns.
The vertebrates traditionally include the hagfish, which do not have proper vertebrae due to their loss in evolution,[5] though their closest living relatives, the lampreys, do.[6] Hagfish do, however, possess a cranium. For this reason, the vertebrate subphylum is sometimes referred to as "Craniata" when discussing morphology. Molecular analysis since 1992 has suggested that hagfish are most closely related to lampreys,[7] and so also are vertebrates in a monophyletic sense. Others consider them a sister group of vertebrates in the common taxon of craniata.[8]
The populations of vertebrates have dropped in the past 50 years[9].