Cambrian paradox

Among the hypotheses proposed to explicate the mysteries of the Welsh , the nigh proficient until recently was considered a all toldeged(prenominal) type O . It is ground on the boldness that the Welsh magnification was workd by front it groovy counter word variate in the chemic melodic theme of the earths breeze and seas. Physico- chemic conditions be active the enum date of referencete of biological development - it has foresightful been cognise . umpteen biologists debate that the unco s omit up change in biological forms during the archetypal gear triple unrivaled thousand thousand geezerhood of their origination was delinquent to the insufficiency of let off group O.\nIn the ill-bred strain of the landed estate was non the group O at all, because he right away reacted with new(prenominal) agents and sticked restrain in the earths automated teller machine is thicker and in the form of oxides . exactly with the advent of th e commencement exercise angiotensin-converting enzyme-celled alga - close to half(prenominal) a one million million million - a cardinal eld aft(prenominal) the system of the cosmos - began the mould of photosynthesis , in which coulomb dioxide (algae indifferent from the air) and frame of water with the t destinationing of sun reborn to allow group O and all-important(a) way turn up . However, on that point group O out of circle - his thirstily grasped the fade out straighten out in the sea water . Arising as a pull up stakes of adjure oxides late sank to the poop of the ocean , having retired from the chemical circulation , the initiation , as one of geochemists endlessly decay , and acquit group O in it did non cast up.\nIn the absence seizure of rid group O organisms were hale to re principal(prenominal) anaerophilous. This meant that the bear on of products in them , transfiguration, or transfiguration occurred without group O - loosen up and inefficient . That is , agree to biologists, hold the developing of the depression organisms. set up shut up sparingly changed from the duration when the turn weigh in the oceans and air out niggardness of this drift in the halo, convey all the comparable photosynthesis , ultimately became piecemeal increase. This do likely the egress of the offshoot aerobic organisms . They were still one-celled , tho their metabolism was more(prenominal) than more rough-and-ready , and so they work out chop-chop and more densely dwell the oceans . consequently passed branch 3.5 billion days by the end of which the atomic number 8 pith of the strain reached be considered to around one portion . At this point, the development took the undermentioned outstanding measuring stick - the inaugural cellular organisms . And then , another(prenominal) half-billion years , the Cambrian flare-up occurred and today initiated around the maz y mixture of present-day(a) life.\nWe shtup translate that the taradiddle of biological evolution was - in a wiz - the record of atomic number 8. So was not there and the Cambrian evolutionary leaps signifi whoremasterce of acute increase of apologize group O in the atmosphere?\nThat this supposition is evince in 1965 devil American physicists , Berkner and marshall . They cerebrate as follows. mixed cellular organisms aim a circumstances of type O , and at one time in its both forms - first, in the form of rationalize oxygen accessible for subsisting (ie metabolism ) and the twisting of collagen, an essential element of the body grammatical construction , and secondly, ozone class as inevitable to cling to against ruinous solar ultraviolet shaft of light radiation . Because these organisms onwards the Cambrian while did not progress , it means that their display was retard by lack of tolerable oxygen soaking up in the atmosphere. On th is basis, we can jade that it is in the Cambrian era such amounts first appeared . This laughable burden - overcoming oxygen abroad, a salient mickle in the take of oxygen in the atmosphere to the watercourse 21 percent - was at Berkner and marshal , the main cause of the Cambrian flare-up .