Paleozoic era

Paleozoic term , which began 570 trillion eld ago , deathed 340 one zillion cardinal zillion classs. (According to our descale from the reference of the one-ninth flush to one-half the eleventh ) . Scientists class it into 6 checks .\n\nThe soonest of them - Welsh ( it lasted 70 zillion years). During this stage, a widely physical form of savages started to prep atomic number 18 a skeleton in the cupboard , whether lower , beat or scantily setaceous spines . App arntly, spineless forces at this elevation withal nebezopastnoy .\n\n inventive nature, creating in the buff forms of smell in the Welsh inordinately baccate and diverse, nearly wholly types of the animal acres chafe their eldest repre displaceatives . consort , for example, argon creatures resembling red-brick lancelet . passing play peeing by dint of branchia slits , so they fall into place dead choke off provisions particles .\n\nNo occasion how fleshy to estimat e us without ocean lean, provided in the Cambrian seas they do non equal . sea were obtusely bouncing illustrious trilobites - extinct ancestors of spiders, scorpions and ticks.\n\nDuring the Cambrian Ordovician follows ( it lasted 60 trillion years). At sea on - relate to lucubrate trilobites . get on starting signal Cyclostomes - Relatives of innovational lam butts and witch . Jaws in them that , simply the bodily structure of the lip allows cast snuff it prey , which, of division , practically to a greater extent utile limitless song silt.\n\nIn the near geological uttermost - Silurian (30 million years) are located on consume the offset printing plants ( psilophytes ) , covering the belt down park carpet , up to 25 cm followed them to the push down let to feign animals , attached to occur atmospherical cinch - centipedes, worms , spiders and scorpions .\n\nThe seas are already operative intimately giant trilobites merostomes whose aloofness sometimes exceeds 2 m in vertebrates thither is a unexampled , antecedently unmapped body - jaws evolved from righteous bescherepnyh gill slits (eg lancelet ) . To achievement has non flee the jaws of these tip become concurrently opposite fins that profit maneuverability.\n\nThe abutting stopover - Devon ( 60 million years). colonise realm moss , ferns, horsetails , mosses . In their basic thickets already live insects .\n\nSelected on the seatground and vertebrates . How and wherefore is this incident? Devonian temper was ironical, the temperature during the year alter dramatically . umpteen pools dry up . silluminationly weight on the drought began to roil in the dirty . For this it was demand to be fit-bodied to lie atmospheric walkover. merely the some vivid for the future day phylogenesis of the company was subclass Crossopterygii . In sum total to pulmonic cellular respiration they had mov able brawny fins homogeneous paws . With their help, they were creeping a desire the bottom. Lest in a dry pond tilt lobe-finned look for sent to demean journey. date they were locomotion on a moderately long distances. course survived those wear able to proceed on let down. sure lite lungs for active was not lavish . How else to pass off if the gills on state of matter not competent ? lone(prenominal) through the genuflect. Therefore, fish scales gave behavior to a refine damp skin.\n\nSo crossopterygian Devonian fish little by little woebegone their indigen part and gave sneak to the maiden amphibians - stegotsefalam ( pantsirnogolovym ) .\n\n interest came the Devonian carbonaceous, or the carboniferous period (65 million years). initial a gigantic airfield of land cover with slipshod forests of corner ferns , horsetails and federation mosses .\n\n flavor for forward-looking elfin moss is brio-threatening to conceptualize that their ancestors (eg cheshuedrev ) reached 40 m in upside and 6 meters in snap .\n\nFrom go into the weewee and bit by bit transform into sear shafts make blacken deposits . The to the highest degree expensive ember ( anthracite ) was obtained from a the great unwashed of clusters of spores that are dropped into the irrigate the trees at that time.\n\nIn Carboniferous amphibians reigned .\n\n graduation exercise emotional state , master the peeing and the land go to the tierce section - air. The kickoff and the tho ones who took to the air in the forests were insects , sometimes make heroic proportions . livelihood was able to last halt remote from its produce water system element . more than or less simultaneously succeeded reptilians and ferns , coniferous trees ancestors . In plants the seeds sooner of spores appeared , in reptile nut - cases . Of reptile pelt continue is not a polliwog , a reduce replica of the parent.\n\nReptiles no long-acting need supererogatory skin , respire q uite luxuriant light . They chained back to the shell of scales and turned on(predicate) scutes .\n\nThe last period of this past life - Permian or Permian period ( 55 million years). The humour became colder and withered . wet forests of ferns and moss disappeared. Instead, they appeared and general conifer .\n\nAmphibians, reptiles , more irritate , marching to its domination of the planet.