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An essay about a life changing experience
Since the most dramatic instances of speciation seem to have happened in the aftermath of mass extinctions, this essay will survey extinction first. A corollary to is that if any critical nutrient falls low enough, the nutrient deficiency will not only limit growth, but the organism will be stressed. If the nutrient level falls far enough, the organism will die. A human can generally survive between one and two months without food, ten days without water, and about three minutes without oxygen. For nearly all animals, all the food and water in the world are meaningless without oxygen. Some microbes can switch between aerobic respiration and fermentation, depending on the environment (which might be a very old talent), but complex life generally does not have that ability; nearly all aerobic complex life is oxygen dependent. The only exceptions are marine life which has adapted to . Birds can go where mammals cannot, , for instance, or being , due to their . If oxygen levels rise or fall very fast, many organisms will not be able to adapt, and will die.
The most significant branch of evolution’s tree of life may have been the first, when bacteria split into two branches; . Darwin’s notion of slowly accumulating differences through descending organisms gradually leading to new species is confounded at the single-celled level in particular, as microbes swap DNA with abandon. The so-called tree of life at the microbe level better resembles a web. The classifications in the evolutionary tree of life are by no means settled, with , but every scientist still thinks that it is a tree, with perhaps some webby roots.
An essay about a life changing ..
This essay presents a , and nearly half of the events happened during the timeframe covered by this essay's first half, which includes almost the entirety of Earth's history. Humanity's tenure amounts to a tiny sliver of Earth's history, and surveying pre-human events was partly intended to help readers develop a sense of perspective. We are merely Earth's latest tenants. We have unprecedented dominance, but we are quickly destroying Earth's ability to host complex life. As my astronaut colleague openly wondered, is ? Is our path of destruction inevitable, as we plunder one energy resource after another to exhaustion? Will depleting Earth's hydrocarbons be the latest, greatest, and perhaps final instance?
The chimpanzee and human lines seem to have split , and some recent estimates are as low as 4.6 mya. The species perhaps the dates to about seven mya, but the findings have also been used to argue for pushing the . Whatever the timing that scientists eventually agree on, the splits of orangutans first, gorillas second, and chimpanzees last (and the bonobo split arguably about a million years ago) almost certainly will not change. The between 5.8 and 5.2 mya may have been the reason for the split, as the resulting droughts from those Mediterranean Sea drying episodes further shrank the African rainforest. As with so many other evolutionary events, the line that led to humans began to leave the trees as the losers of rainforest life and adapted to new environments probably out of necessity, not a sense of adventure and opportunity. Those apes pushed to the margins learned to walk upright and learned to eat new foods such as roots.
A Life Changing Event Essay -- Personal Experience
The energy from controlled fire allowed humans to , , and socially organize in new ways. Humans commandeered energy that otherwise and used it for immediate human benefit. It was also the first great human robbery. All heterotrophs “” energy from other life forms to live. The primary exception is the symbiosis that . But no animal had ever robbed energy from ecosystems on that scale before. By making fires, humans were liberating many times the energy that their biological processes used - energy that could have fed forest ecosystems. While humans were only using deadwood, it was the least destructive to forest ecosystems. But when humans began burning forests to flush out animals to kill and make biomes suitable for animals to hunt, they were destroying and altering ecosystems on a vast scale. A cord of wood provides about four years of the calories that fuel a human adult’s body, and one hectare can provide a sustainable annual harvest of about ten years of human calories. A family of four using a hectare for firewood on a sustainable basis would be using more than twice their caloric intake for burning wood. Very little of that released energy would benefit humans if they burned it over a campfire, as humans did for the entire epoch of the hunter-gatherer; that liberated energy largely went straight into the sky. The direct benefit to humans would be the energy that went into cooking food, what warmed human flesh, what was used to make tools, and the benefits of scaring off predators and providing light at night. More indirect benefits would have been ecosystem changes to provide human-digestible calories, such as American Indians burning the woodlands and plains to make environments conducive to animals that they could easily hunt. In , the earliest epochs are the most uncertain, but saying that hunter-gatherer humans used 2.5 times their dietary calories in their economy is probably, perhaps greatly, understating the case. That 5% efficiency number is also a rough estimate, and both numbers could be refined by a scientifically performed effort. Maybe somebody has already done it. The numbers in that table for subsequent epochs are more accurate, and the most accurate of all are those for , and I live in one. The increases in efficiency became more modest with each epoch as the limits of were approached.
Did the control of fire to , ? Or did merely use it to begin dominating the world? Was cooking the seminal event in the appearance of humans? Those questions may not be definitively answered in my lifetime, and led to the somewhat uncertain title of this chapter. Highly transformative developments coincided with the appearance and dispersal of , which was a radical break from all that came before – biologically, technically, and culturally – and strongly implies great cognitive enhancements. I believe that the control of fire and cooking would leave deep cultural and biological impacts on the human journey, and because barely changed during its nearly two-million year tenure on Earth, both in biology and in Acheulean artifacts, I favor Wrangham’s hypothesis, at least until the Next Big Finding. Just as Einstein said that and that his theories would one day become obsolete, but that their best parts would survive in the new theories, I suspect that significant aspects of Wrangham’s hypothesis will live on in successor hypotheses, and other scientists have been following Wrangham’s lead.
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the essays briefly write about life changing event to adulthood
, who had a scientific career at General Electric, also believed that the energy industry would welcome his solid-state FE device. He , expecting a tickertape parade. The opposite happened as shadowy interests destroyed his business deals, in a situation . Sparky did not take the hint and kept trying, which led to death threats. After their final threats, Sparky fled into hiding, where , and Sparky died the next week of a “heart attack.” Dying that way who played near Sparky’s level, and , and the event shortened his life. Dennis, Sparky, and many others like them lost their naïveté the hard way, but the field has been filled with newcomers who deny the reality of organized suppression as they charge forward with visions of riches and fame. It is perhaps the most common level of awareness where FE newcomers will be found. Most never develop anything worth suppressing so will never know any differently, and will enter and leave the field with that beginner's level of awareness intact. However, with enough people trying and either living to tell the tale, or others chronicling their dire fates, which , and the Internet spreading information like never before, few FE newcomers have much excuse for being unaware of the fates of their professional ancestors. The Internet is like the , or the , ratcheted up by a few orders of magnitude, and my website, this essay, and my comprise my attempt to take advantage of its potential.
How to write an essay about a life changing event - …
Those attributes are far more easily described than achieved, but my essay is about developing them. The rest of this essay explores those issues in some depth. More than 30 years after I began dreaming of changing the energy industry, I to organize the thousands of reactions to the of FE that I have witnessed, and I will refer to it for the remainder of this essay. I have yet to find a reaction during my journey that does not easily fit into that framework’s categories.
Essay on Life Changing Events - 898 Words
So, my fellow humans, will we experience the Sixth Mass Extinction, which might take us with it, or will humanity experience its Fifth Epochal Event? The choice has always been ours, and we are quickly reaching the point where it will likely be one or the other, with little feasible middle ground. Fuller stated that if humanity had not achieved the Fifth Epochal Event by the 1980s, the probability of humanity's surviving its self-made catastrophe would be less than 50%. Here we are, three decades later, and Fuller may still be right, but time is very short. , and more than 40 years of this pursuit as of 2015 has been teaching it to me. But the window of opportunity to avert a global calamity is closing, and if humanity does not begin to embrace the direction of the Fifth Epochal Event in my lifetime, then Fuller might be accused of being overly optimistic, if there is anybody left to accuse him.
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