Vertebrate
Vertebrates /ˈvɜːrtᵻbrᵻts/ comprise all species of animals within the subphylum Vertebrata /-ɑː/ (chordates with backbones). Vertebrates represent the overwhelming majority of the phylum Chordata, with currently about 64,000 species described. Vertebrates include the jawless fish and the jawed vertebrates, which include the cartilaginous fish (sharks and rays) and the bony fish. A bony fish clade known as the lobe-finned fishes is included with tetrapods, which are further divided into amphibians, reptiles, mammals, and birds. Extant 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 about 4% 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, though their closest living relatives, the lampreys, do. 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 the hagfish are most closely related to lampreys, and so also are vertebrates in a monophyletic sense. Others consider them a sister group of vertebrates in the common taxon of craniata.
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I did this in class. ( I believe it was English) I was sooo bored.
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@ NH please don't kill off portia
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hey guys, I'm baaack! it just that everything got on top of me atm and finally got a chance to...
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Lion vs. african wild dog.
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local man disrupts everything
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it's been a while, hasn't it?
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something you didnt want to
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Cobra is afraid of caterpillars. this is a proof that he's a repressed bisexual. CQFD
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she only texts u when no one else talks 2 her lol
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Got a new phone nd decided to try doodlin on it
Happy Birthday Sil!
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i now im probly a little late but who cares. so heres a muffin dog thing