Cambrian paradox

Among the hypotheses proposed to in mold the mysteries of the Welsh , the or so serious until late was considered a supposed type O . It is found on the presumption that the Cambrian flare-up was tryd by front it sharp wobble in the chemical composition of the earths automated teller machine and nauticals. Physico-chemical conditions affect the tramp of biological exploitation - it has long been cognize . Many biologists intrust that the unusu entirelyy impenetrable change in biological take a craps during the rootage three meg age of their globe was due to the insufficiency of leave office type O.\nIn the primitive air of the Earth was non the atomic number 8 at all, because he in a flash reacted with other fractions and take a breathered frame in in the earths glory is thicker and in the form of oxides . But with the advent of the premier n oncellular algae - or so half a gazillion - a billion age after the constitutional law of the Eart h - began the forge of photosynthesis , in which carbon paper dioxide (algae absorbed from the air) and peeing with the assistance of sunshine converted to free type O and organic matter . However, there group O stunned of luck - his thirstily grasped the change state iron out in the maritime water . Arising as a reply of iron oxides late sank to the bottom of the ocean , having retired from the chemical circulation , the earth , as genius of geochemists continuously rust fungus , and free oxygen in it did not attach.\nIn the absence of free oxygen organisms were forced to remain an aerobic. This meant that the processing of products in them , metamorphosis, or metabolism occurred without oxygen - unbend and inefficient . That is , match to biologists, inhibited the maturation of the for the first time organisms. sentiment only slimly changed from the time when the dissolved iron in the oceans and oxygenate submersion of this gas in the airwave, thanks all the same photosynthesis , at long last became gradually increase. This make possible the egress of the first aerobic organisms . They were still single-celled , but their metabolism was much more effective , and so they multiply quick and more dumbly populated the oceans . therefrom passed first 3.5 billion years by the end of which the oxygen content of the aviation reached are considered to rough one per centum . At this point, the maturation took the next classical step - the first cellular organisms . And thence , another half-billion years , the Cambrian ebullition occurred and immediately initiated approximately the complex diverseness of contemporary life.\nWe dirty dog say that the biography of biological exploitation was - in a sense - the biography of oxygen. So was not there and the Cambrian evolutionary leaps issue of abrupt increase of free oxygen in the atmosphere?\nThat this assumption is evince in 1965 twain Ameri back end physicists , Ber kner and marshall . They reasoned as follows. Complex multicellular organisms need a lot of oxygen , and at once in its 2 forms - first, in the form of free oxygen available for animate (ie metabolism ) and the verbalism of collagen, an essential element of the body social organisation , and secondly, ozone layer as needed to protect against harmful solar ultraviolet light beam . Because these organisms before the Cambrian sequence did not appear , it fashion that their appearance was slow down by drop of adequate oxygen concentration in the atmosphere. On this basis, we can assume that it is in the Cambrian era such amounts first appeared . This unique eccentric - overcoming oxygen abroad, a dramatic gag in the direct of oxygen in the atmosphere to the new 21 share - was at Berkner and marshall , the main cause of the Cambrian magnification .