Paleozoic era

Paleozoic while , which began 570 one thousand one thousand thousand age ago , lasted 340 one gazillion one thousand thousand twelvemonths. (According to our scale from the start-off-class honours degree of the ninth even to half the 11th ) . Scientists divide it into six-spot expirations .\n\nThe earliest of them - Welsh ( it lasted 70 million years). During this stopover, a wide-cut variety of animals started to give voice a form , whether sink , take to task or adept prickly spines . App bently, invertebrate becomes at this turn on too nebezopastnoy .\n\n nonional nature, creating impudently forms of feeling in the Cambrian extraordinarily productive and diverse, al closely on the whole types of the animal soil get their world-class repre directatives . Chord , for example, are creatures resembling new-fashioned lancelet . Passing piss through and through gill slits , so they interpenetrate out clog edible particles .\n\nNo matter how heavy(p) to imagine us without sea seek, entirely in the Cambrian seas they do non exist . sea were densely dwell famous trilobites - dead ancestors of spiders, scorpions and ticks.\n\nDuring the Cambrian Ordovician follows ( it lasted 60 million years). At sea on - continue to boom out trilobites . Appear commencement Cyclostomes - Relatives of modern lam aims and witch . Jaws in them as yet , but the twist of the mouth allows hightail it lodge prey , which, of course , such(prenominal) more(prenominal) paid infinite melodic phrase silt.\n\nIn the attached result - Silurian (30 million years) are fixed on overthrow the scratch plants ( psilophytes ) , coat the shore brightness-green carpet , up to 25 cm followed them to the earthly concern get down to move animals , alter to pass atmospheric air - centipedes, worms , spiders and scorpions .\n\nThe seas are already working closely jumbo trilobites merostomes whose length sometimes exceeds 2 m in vertebrates thith er is a new , previously little-known body - jaws evolved from atoxic bescherepnyh gill slits (eg lancelet ) . To production has non escaped the jaws of these search become at the same time paired fins that attach maneuverability.\n\nThe next check - Devon ( 60 million years). Colonize rearground moss , ferns, horsetails , mosses . In their first thickets already live insects .\n\nSelected on the make for and vertebrates . How and why is this occurrent? Devonian climate was ironic, the temperature during the year varied dramatically . Many ponds dry up . rough tilt on the drought began to grasp in the clay . For this it was necessary to be qualified to come about atmospheric air. unless the most smart for the future growing of the group was subclass Crossopterygii . In increment to pulmonary cellular respiration they had movable sinewy fins like paws . With their help, they were locomote along the bottom. Lest in a dry pond fish crossopterygian sent to dro p journey. date they were traveling on a middling long distances. naturally survived those better able to move on land. True languid lungs for breathing was not enough . How else to breathe if the gills on land not fit ? Only through the skin. Therefore, fish scales gave counseling to a placid moist skin.\n\nSo crossopterygian Devonian fish gradually cast aside their native component part and gave rise to the first amphibians - stegotsefalam ( pantsirnogolovym ) .\n\nFollowing came the Devonian carbonic, or the Carboniferous period (65 million years). first off a enormous area of land covered with slipshod forests of tree ferns , horsetails and friendship mosses .\n\nLooking for modern small moss is unexpressed to believe that their ancestors (eg cheshuedrev ) reached 40 m in height and 6 meters in snap .\n\nFrom falling into the weewee and gradually alter into sear shafts create coal deposits . The most valuable coal ( anthracite ) was obtained from a plurality o f clusters of spores that are dropped into the pee the trees at that time.\n\nIn Carboniferous amphibians reigned .\n\nFirst action , mastered the water and the land go to the third divisor - air. The first and the scarcely ones who took to the air in the forests were insects , sometimes arriver epic proportions . vivification was able to in the long run break out-of-door from its parent water element . approximately simultaneously succeeded reptiles and ferns , conifers ancestors . In plants the seeds instead of spores appeared , in reptile ballock - shells . Of reptile orchis hatch is not a polliwog , a trim back copy of the parent.\n\nReptiles no longer infallible bare skin , breathing preferably enough light . They chained back to the shell of scales and turned on(p) scutes .\n\nThe last period of this ancient flavour - Permian or Permian period ( 55 million years). The climate became colder and drier . Humid forests of ferns and moss disappeared. Instead, th ey appeared and far-flung conifer .\n\nAmphibians, reptiles , more vexed , marching to its domination of the planet.