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Worlds deepest living fishes survives under pressure

fishes survives under the largest pressure during millions of years. peixe das profundezas sobrevive sob a maior pressao do mar durante milhões de anos. Prehistoric fish are various groups of fishes that lived before recorded history. A few, such as the coelacanth still exist today and are considered living fossils. The first fish and the first vertebrates, were the ostracoderms, which appeared in the Cambrian Period, about 510 million years ago, and became extinct at the end of the Devonian, about 350 million years ago. Ostracoderms were jawless fishes found mainly in fresh water. They were covered with a bony armor or scales and were often less than 30 cm (1 ft) long. The ostracoderms are placed in the class Agnatha along with the living jawless fishes, the lampreys and hagfishes, which are believed to be descended from the ostracoderms. The first fish with jaws, the acanthodians, or spiny sharks, appeared in the late Silurian, about 410 million years ago, and became extinct before the end of the Permian, about 250 million years ago. Acanthodians were generally small sharklike fishes varying from toothless filter-feeders to toothed predators. They were once often classified as an order of the class Placodermi, another group of primitive fishes, but recent authorities tend to place the acanthodiaes or that both groups share a common ancestor. The placoderms, another group of jawed fishes, appeared at the beginning of the Devonian, about 395 million years ago, and became extinct at the end of the Devonian or the beginning of the Mississippian (Carboniferous), about 345 million years ago. Detailed anatomical studies of fossil remains by the Swedish scientist Erik Stensiö strongly suggest that the placoderms were closely related to sharks. Placoderms were typically small, flattened bottom-dwellers, however, many, particularly the arthrodires, were active midwater predators. Dunkleosteus was the largest and most famous of these. The upper jaw was firmly fused to the skull, but there was a hinge joint between the skull and the bony plating of the trunk region. This allowed the upper part of the head to be thrown back, and in arthrodires, this allowed them to take larger bites. The cartilaginous-skeleton sharks and rays, class Chondrichthyes, which appeared about 370 million years ago in the middle Devonian, are generally believed to be descended from the bony-skeleton placoderms. The cartilaginous skeletons are considered to be a later development. The modern bony fishes, class Osteichthyes, appeared in the late Silurian or early Devonian, about 395 million years ago. The early forms were freshwater fishes, for no fossil remains of modern bony fishes have been found in marine deposits older than Triassic time, about 230 million years ago. The Osteichthyes may have arisen from the acanthodians. A subclass of the Osteichthyes, the ray-finned fishes (subclass Actinopterygii), became and have remained the dominant group of fishes throughout the world. It was not the ray-finned fishes, however, that led to the evolution of the land vertebrates. The ancestors of the land vertebrates are found among another group of bony fishes called the Choanichthyes or Sarcopterygii. Choanate fishes are characterized by internal nostrils, fleshy fins called lobe fins, and cosmoid scales. The choanate fishes appeared in the late Silurian or early Devonian, more than 390 million years ago, and possibly arose from the acanthodians. The choanate fishes include a group known as the Crossopterygii, which has one living representative, the coelacanth (Latimeria). During the Devonian Period some crossopterygian fishes of the order (or suborder) Rhipidistia crawled out of the water to become the first tetrapods. The story of vertebrate evolution started in the seas of the Cambrian period, when jawless, toothless, soft-bodied fishlike creatures wriggled through the water, sucking up microscopic food particles. Only after tough, non-decaying bone was developed (initially as a scaly outer covering and later within the body) did fossils form and become preserved in the rocks. And only then could paleontologists take up the story with any certainty. The earliest traces of bony scales are found in rocks of the Late Cambrian period, and the first recognizable vertebrate fish has been found in Australian rocks of Early Ordovician age. So, the first chapter in the vertebrate evolution starts with the ancient Arandaspis, a fish about 6in/15cm long with no jaws, no teeth and no fins other than a tail. It did, however, have gills and a stiffening rod of cartilaginous material (the notochord) that served as a backbone. w1tv 10 minutes. http://w1tv.sites.uol.com.br

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Strength Training For Sex Appeal (College Health Guru)

You workout all the time - don't you want to make sure that the exercises you're doing will get you a sexy body and the natural sex appeal you desire? Learn More: http://College.Healthguru.com/content/video/watch/100527/Exercising_for_Strength/?yt

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Immersion: The Videogame Car

The team at Rooster Teeth Labs tries to make their real lives more like video games. In this initial installment, they recreate a video game car in the real world.

Immersion  Rooster  Teeth  Car  Video  Game  GTA  Grand  Theft  Auto  funny  science  pickup  mount  yakuza  experiment  humor 

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RUN FROM THE CURE - The Rick Simpson Story (Part 1 of 7)

Series (Part 1 of 7) FULL (1 HOUR) VERSION: http://www.youtube.com/watch?v=0psJhQHk_GI "They let the genie out of the bottle with this one, and the big money can't put it back in." A Film By Christian Laurette - After a serious head injury in 1997, Rick Simpson sought relief from his medical condition through the use of medicinal hemp oil. When Rick discovered that the hemp oil (with its high concentration of T.H.C.) cured cancers and other illnesses, he tried to share it with as many people as he could free of charge - curing and controlling literally hundreds of people's illnesses... but when the story went public, the long arm of the law snatched the medicine - leaving potentially thousands of people without their cancer treatments - and leaving Rick with unconsitutional charges of possessing and trafficking marijuana! Canada is in the middle of a CANCER EPIDEMIC! Meet the people who were not allowed to testify on Rick's behalf at the Supreme Court of Canada's Infamous Rick Simpson Trial on September 10, 2007... INCLUDING A MAN WHO WAS CURED OF TERMINAL CANCER USING HEMP OIL! IF YOU SEE ONLY ONE DOCUMENTARY THIS YEAR... MAKE IT THIS ONE! Download the whole movie for free and share it... at http://www.phoenixtearsmovie.com VIEW ALL 7 FILES AT http://www.youtube.com/chrychek Please make a donation in any amount using the donate button on phoenixtears.ca and together we can CRUSH CANCER without government support. The world deserves a cure for cancer. Please support this world-changing cause. http://www.phoenixtears.ca http://www.phoenixtearsmovie.com

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Elephant mating, fighting & pregnancy - BBC Animals

From the creation of a fertile egg in a female matriarch, to the battles to find a mate, to the long biological journey to fertilisation, this amazing short video from BBC wildlife show 'Animals: The Inside Story' charts the incredible story of reproduction in the elephant world.

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LADY GAGA - Alejandro (Un - Official Music Video) NEW Official ALEJANDRO Video Released June 8

LADY GAGA - *Alejandro from "THE FAME MONSTER" HD720p © 2009/2010 Interscope / Streamline Records / KonLive / Cherrytree Live Footage from these major cities : Los Angeles, USA Toronto, Canada Perth, AUS ●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●● OFFICIAL "ALEJANDRO" MUSIC VIDEO RELEASED June 8, 2010 ● More Info and Official Release of "Alejandro" http://www.ladygaga.com ● Watch Lady GaGa and Lary King LIVE featuring - Alejandro (Teaser) http://www.youtube.com/watch?v=6qF9Sp... ● Lady Gaga performs 'Alejandro' on American Idol here http://www.youtube.com/watch?v=QicA3Q... ● "All That She Want's" from Ace Of Base mixed with a bit of "La Isla Bonita" from Madonna ?? Remember them ? ● Thank you ryanroxofficial for the inspiration. You can check out ryanroxofficial channel and his version of Alejandro here: http://www.youtube.com/user/ryanroxof... Please support his page too. ●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●● *This is a free-press presentation. -non profit, entertainment purposes only - © 2010 Agatha Vincent / Skruffy Puppy Films & Production Please subscribe and I will do the same. Thanks friends. ▄ █ ▄ █ ▄ Agatha Vincent ___________________________________________________________________________ *Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for fair use for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use ___________________________________________________________________________

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Do Women Prefer Fat Guys Over Metro Guys?

Watch more at http://www.theyoungturks.com

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slipknot - Dead Memories

slipknot song click this link:http: http://www.sendspace.com/file/ws9c0v its safe to download

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Stupid Design

This is an from a presentation by Neil deGrasse Tyson at the 2006 Beyond Belief conference. Neil is the director of the Hayden Planetarium in the Rose Center For Earth and Space at the American Museum of Natural History. In this Powerpoint entitled "Stupid Design" Tyson points out some of the glaring evidence for a universe without a designer.

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Added: 5066 days ago by blogpost_biz

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Facebook, Twitter Revolutionizing How Parents Stalk Their College-Aged Kids

'E-Mom' Gloria Bianco shows Jim and Tracy how geographical distance is no longer a roadblock to shamelessly interfering with the lives of your children.

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George Lakoff: Moral Politics

UC Berkeley professor of Cognitive Science and Linguistics George Lakoff explores how successful political debates are framed by using language targeted to people's values instead of their support for specific government programs in this public lecture sponsored by the Helen Edison Series at UC San Diego. Series: "Helen Edison Lecture Series" [11/2005] [Public Affairs] [Show ID: 11194]

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How To Time Travel

Late for school? A meeting? Just take a wormhole -- you'll be there before you know it.

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