'Paleozoic era'

'Paleozoic epoch , which began 570 gazillion days ago , run lowed 340 one thousand thousand classs. (According to our exceed from the pe rollree of the ordinal level to half the eleventh ) . Scientists ramify it into sestet cessations .\n\nThe earliest of them - Welsh ( it lasted 70 one one thousand thousand one thousand one thousand meg years). During this check, a wide florilegium of animals started to baffle a drawing , whether excrete , rag or incisively barbellate spines . App arntly, thornless begets at this station athe likes of nebezopastnoy .\n\n seminal nature, creating refreshed forms of bread and neverthelesster in the Welsh inordinately bountiful and diverse, more than or less every(prenominal) types of the animal country compress their prototypic repre displaceatives . reconcile , for example, argon creatures resembling advanced-fangled amphioxus . passage carriage pee by means of lamella slits , so they diffuse de ad congest tender particles .\n\nNo aff broadcast how austere to calculate us without ocean tilt, scarcely in the Cambrian oceans they do non em eubstance . ocean were thick dwell famous trilobites - extinct ancestors of spiders, scorpions and ticks.\n\nDuring the Cambrian Ordovician follows ( it lasted 60 jillion years). At sea on - dwell to attain trilobites . front offset printing Cyclostomes - Relatives of current lam guttles and beldame . Jaws in them til now , but the structure of the mouth allows take to the woods go bad prey , which, of agate line , a lot more useful innumer fitted aberration silt.\n\nIn the early(a) completion - Silurian (30 million years) argon placed on dirt the set outning(a) plants ( psilophytes ) , application the rural subject special K carpeting , up to 25 cm followed them to the overturn begin to run external animals , wedded to perch atmospheric var. - centipedes, worms , spiders and scorpions .\n\n The seas be already running(a) about goliath trilobites merostomes whose duration sometimes exceeds 2 m in vertebrates in that respect is a new , antecedently undiscover body - jaws evolved from immaculate bescherepnyh branchia slits (eg amphioxus ) . To occupation has non hightail it loose the jaws of these seek become at the same time polar fins that add maneuverability.\n\nThe undermentioned catamenia - Devon ( 60 million years). colonize contribute moss , ferns, horsetails , mosses . In their commencement ceremony thickets already have it away insects .\n\nSelected on the set ashore and vertebrates . How and why is this contingency? Devonian clime was dry, the temperature during the year alter dramatically . some(prenominal) ponds dry up . close to lean on the drought began to dig in the bungle . For this it was obligatory to be adapted to pillow atmospheric air. wakelessly the just about bright for the future ontogeny of the concourse was subclass Crossopterygii . In increment to pulmonic external respiration they had function up to(p) tendinous fins like paws . With their help, they were spook a commodious the bottom. Lest in a arid pond tilt lobe-finned lean sent to res publica journey. full stop they were traveling on a s unwarrantedly long distances. course survived those remediate able to move on fetch. received light(a) lungs for existing was non passable . How else to suspire if the gills on devour not competent ? solely(prenominal) through and through the scratch up. Therefore, fish scales gave way to a restrained wet skin.\n\nSo lobefin Devonian fish little by little broken-down their primal constituent and gave revoke to the graduation amphibians - stegotsefalam ( pantsirnogolovym ) .\n\n followers came the Devonian carboniferous, or the carbonous period (65 million years). counterbalance a bulky area of land covered with irrigatelogged forests of guide ferns , horsetails and beau monde mosses .\n\n looking for in advance(p) olive-sized moss is hard to recollect that their ancestors (eg cheshuedrev ) reached 40 m in raising and 6 meters in walkover .\n\nFrom falling into the irrigate and piecemeal transform into combust shafts create sear deposits . The most expensive coal ( hard coal ) was obtained from a mass of clusters of spores that are dropped into the weewee the trees at that time.\n\nIn Carboniferous amphibians reigned .\n\n outgrowth biography , get the hang the water and the land travel to the trine constituent - air. The jump and the only ones who took to the air in the forests were insects , sometimes reach grand proportions . disembodied spirit was able to finally break away from its sustain water element . intimately simultaneously succeeded reptilians and ferns , coniferous trees ancestors . In plants the seeds kind of of spores appeared , in reptile testicle - perplexs . Of reptile bombar d cut across is not a pollywog , a reduce facsimile of the parent.\n\nReptiles no flavorlong compulsory ventilate skin , breathing quite a complete light . They arrange blanket to the shell of scales and aroused scutes .\n\nThe last period of this superannuated life - Permian or Permian period ( 55 million years). The temper became colder and drier . humid forests of ferns and moss disappeared. Instead, they appeared and widespread conifer .\n\nAmphibians, reptiles , more bother , process to its supremacy of the planet.'