essay on biochemistry in day to day life

The Carboniferous also marked the rise of reptiles, which between 320 and 310 mya. The very term has become rather informal with the rise of , as birds and mammals descended from “reptiles” but are not called that. The term refers to groupings such as reptiles, in which part of the clade is not classified in the named group; clades (beginning with the last common ancestor and including all descendants) are tidier and scientists often prefer them. Although the issue, as usual, is controversial today, it seems that and reptilian ancestors may have descended from different groups of tetrapods, and some seemingly added to the controversy. But the idea that reptiles are is still prominent. Most importantly, reptiles were the first , a clade that includes birds and mammals, which do not need to lay their eggs in water and allowed reptiles to . Reptiles then colonized niches previously unavailable to amphibians. The first reptiles were small and ate insects, and laying eggs in trees may have been a solution to arboreal life. Seed plants and amniotes could reproduce on dry land, and their success greatly expanded terrestrial ecosystems.

Essay on biochemistry in day to day life

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Essay on chemistry and biochemistry in day to day life

After I first published this essay in September 2014, I read Paul Boyer's , which surveyed the reactions of Americans to dropping atom bombs on Japan. I read it in relation to my studies regarding the , but what struck me was how similar the reactions to the bombs were to how people view FE today. The primary difference, of course, is that everybody acknowledges that nuclear bombs exist and have been used, while almost nobody acknowledges today that FE technology exists, through , , or . Another obvious difference is that the first use of atomic energy was vaporizing a couple of cities. While the initial American reaction was celebratory and euphoric, it quickly became evident that the USA would not hold a monopoly on nuclear weapons forever, and fears of nuclear attack became part of the fabric of American consciousness, and by 1946, nearly half of Americans were amenable to the idea of a world government that could prevent a nuclear holocaust.

essay on chemistry and biochemistry in day to day life ..

Industrialized nations and are greatly responsible for deforesting Earth, although nations such as Japan have been exporting the devastation, as foreign forests are razed and shipped to Japan, while Japan treats its forests as sacred groves. But also, the poor in former colonial nations have been pushed to ecosystem margins. The prime arable land is usually owned by local oligarchs or foreign corporations; they often raise crops for export to the industrialized nations. . The peasants farm marginal lands, often hillsides, which not only devastate the last refuges of species driven into the hills, but it also erodes the hillsides, , which happened in the Old World long ago. Those dynamics, particularly habitat destruction, are largely behind today’s accelerating Sixth Mass Extinction, also called the . This pattern also extends back for , not just since the ice sheets melted in this latest interglacial interval. The reached 70% or more of global species going extinct. According to a recent estimate, for the human-caused extinction. Other estimates have this level being reached as early as my lifetime, while others think it will be reached in a . The current extinction rate is thought to be higher than those of all previous extinction events other than the one that . Humanity may “achieve” . Biologists and climate scientists are stupefied, and the global propaganda machine chugs along, making everything seem normal, while “scientists” in their employ work long and hard to , , and the rest, in a kind of Potemkin Earth strategy, gleaning profits and playing power games until the end.

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When investigating how ice ages begin and end, and feedbacks are considered. A positive feedback will accentuate a dynamic and a negative feedback will mute it. In the 1970s, and the author of today’s , , , which posits that Earth has provided feedbacks that maintain environmental . Under that hypothesis, environmental variables such as atmospheric and levels, levels, and Earth’s surface temperature have been kept relatively constant by a combination of geophysical, geochemical, and life processes, which have maintained Earth’s inhabitability. The homeostatic dynamics were mainly negative feedbacks. If positive feedbacks dominate, then “runaway” conditions happen. In astrophysics, are responsible for a wide range of phenomena. A runaway greenhouse effect may be responsible for . Climate scientists today are concerned that burning the hydrocarbons that fuel the industrial age . Mass extinctions are the result of Earth's becoming largely uninhabitable by the organisms existing during the extinction event. The ecosystems then collapse Mass extinction specialist recently proposed his as a direct challenge to the Gaia hypothesis.

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There were few dissenting voices in the USA to dropping the atom bombs on Japan, and when luminaries such as , the USA's government went to great lengths to justify the bombings. Also, the day after Hiroshima's bombing, American newspapers began rhapsodizing over the potential of nuclear energy, and although euphoria over nuclear energy's potential quickly faded, nuclear energy promotion was doggedly upbeat. Einstein dismissed nuclear energy as "one hell of a way to boil water," but by the 1950s, the nuclear establishment hired a death camp Nazi to among its many promotional activities. The propaganda is alive and well, as I never heard more pro-nuclear propaganda in my life as I heard in the wake of the , and .

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Energy and the Human Journey: Where We Have Been; …

The genetic testing that has been performed on humanity in the past generation has shown that the founder group’s pattern of migration was to continually spread out, and once the original settlement covered the continents, people did not move much at all, at least until Europe began conquering the world (and there were some ). There is little sign of warfare in those early days of migration, and the leading hypothesis is that people moved to the next valley rather than be close enough to fight each other. Any conflict would have been easily resolved by moving farther out, where more easily killed animals lived. Also, in those virgin continents, people need not have roamed far to obtain food. Today, an !Kung woman will carry her child more than 7,000 kilometers before the child can walk for himself/herself. If an !Kung woman bears twins, it is her duty to pick which child to murder, because she cannot afford to carry two. That demonstrates the limitations of today’s hunter-gatherer lifestyle, but in those halcyonic days of invading virgin continents (which had to be the Golden Age of the Hunter-Gatherer), those kinds of practices probably waned and bands grew fast. When they they split, and the new group moved to new lands where the animals, again, never saw people before. Unlike the case with humans, there would not have been a grapevine so that animals told their neighbors about the new super-predator. The first time that those megafauna saw humans was probably their last time. It is very likely, just as with all predators for all time, and as can be seen with historical hunting events such or , that those bands soon took to killing animals, harvesting the best parts, and moving on. To them it would not have been a “blitzkrieg,” but more like kids in candy stores. After a few thousand years of grabbing meat whenever the fancy took them, or perhaps less, those halcyonic days were over as the far coasts of Australia were reached and the easy meat was gone. When that land bridge formed to Tasmania about 43 kya, people crossed and were able to , until all the megafauna was gone on Tasmania. They also may have worked their way through the food chain, in which the first kills were the true mother lode. Nobody even deigned to raise a spear at anything less than a until they were gone. Then they started killing smaller prey, which eventually did wise up and were harder to kill, so humans had to work at it again and the brief golden age was over. The as they shaped the new continent to their liking, maybe recreating the savanna conditions that they left in Africa, may have also been used to flush out animals if they began to avoid humans.