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So just write your e-mail addresss on the comment box below and we will send the essays on you e-mail address for free.ParentsDescribe the activities of religious people in your countryAct of selfishness that caused unhappinessA food store in your country suddenly closed and caused great troubleA rich man unexpectedly lost all his wealthWhat do you think people of your age can do to improve life in your country?The ideal schoolSomeone had a great disappointment that turned out to be a blessing in disguiseA servant or a worker was badly treated by an employerJealousyTime seems to stand still or go much too quicklyAdvertising exerts too great an influence on our daily livesKeeping fitDescribe an old couple outside your family who live an interesting and happy lifeIs it more important to enjoy your job than to earn a great deal of money?Describe the first hour of a day at schoolThe owner of a local business takes strong action when threatened by outside competitionYou just have one more chance to prove you can do itWaiting for the resultsKeeping coolWrite about occasions when you felt extremely boredHow important is it that people should marry and remain living together permanentlyAn unfair punishmentHe had been dirty, hungry and completely without help.
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But the branch of the that readers might find most interesting led to humans. Humans are in the phylum, and the last common ancestor that founded the Chordata phylum is still a mystery and understandably a source of controversy. Was our ancestor a ? A ? Peter Ward made the case, as have others for a long time, that it was the sea squirt, also called a tunicate, which in its larval stage resembles a fish. The nerve cord in most bilaterally symmetric animals runs below the belly, not above it, and a sea squirt that never grew up may have been our direct ancestor. Adult tunicates are also highly adapted to extracting oxygen from water, even too much so, with only about 10% of today’s available oxygen extracted in tunicate respiration. It may mean that tunicates adapted to low oxygen conditions early on. Ward’s respiration hypothesis, which makes the case that adapting to low oxygen conditions was an evolutionary spur for animals, will repeatedly reappear in this essay, as will . Ward’s hypothesis may be proven wrong or will not have the key influence that he attributes to it, but it also has plenty going for it. The idea that fluctuating oxygen levels impacted animal evolution has been gaining support in recent years, particularly in light of recent reconstructions of oxygen levels in the eon of complex life, called and , which have yielded broadly similar results, but their variances mean that much more work needs to be performed before on the can be done, if it ever can be. Ward’s basic hypotheses is that when oxygen levels are high, ecosystems are diverse and life is an easy proposition; when oxygen levels are low, animals adapted to high oxygen levels go extinct and the survivors are adapted to low oxygen with body plan changes, and their adaptations helped them dominate after the extinctions. The has a pretty wide range of potential error, particularly in the early years, and it also tracked atmospheric carbon dioxide levels. The challenges to the validity of a model based on data with such a wide range of error are understandable. But some broad trends are unmistakable, as it is with other models, some of which are generally declining carbon dioxide levels, some huge oxygen spikes, and the generally relationship between oxygen and carbon dioxide levels, which a geochemist would expect. The high carbon dioxide level during the Cambrian, of at least 4,000 PPM (the "RCO2" in the below graphic is a ratio of the calculated CO2 levels to today's levels), is what scientists think made the times so hot. (Permission: Peter Ward, June 2014)