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South Of My Days Judith Wright Essay - …
The derision was loud from Wrangham’s colleagues…until evidence of was found at in South Africa by using new tools and techniques. The chortling is subsiding somewhat and scientists are now looking for the faint evidence, and long-disputed evidence of 1.5-1.7 mya controlled fires is being reconsidered, although his hypothesis is still widely considered as being only "mildly compelling" at best. New tools may push back the control of fire to a time that matches Wrangham’s audacious hypothesis. Wrangham cited the Expensive-Tissue Hypothesis as partially supporting the Cooking Hypothesis, but , the energy to power the human brain may not have solely derived from cooked food’s energy benefits. Wrangham has cited numerous lines of evidence, one of which is a that has to find honeybee hives and smoke them out; the humans get the honey and the honeyguide gets the larvae and wax. According to recent molecular evidence, the evolutionary split of the honeyguide from its ancestors happened up to three mya, which supports the early-control-of-fire hypothesis. There is great controversy regarding these subjects, from recent findings that to scientists making arguments that to the social impacts of campfires. This section of this essay will probably be one of the first to be revised in future versions, as new evidence is adduced and new hypotheses are proposed.
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Free Essays on Judith Wright South Of My Days Analysis
Artists have been depicting Carboniferous swamps for more than a century, and the . That represents a key Carboniferous issue and perhaps why the period ended. That , and others like it, appeared in the fossil record about 300 mya, when oxygen levels were Earth’s highest ever, at somewhere between 25% and 35%. The almost universally accepted reason for that high oxygen level is that for the entire Carboniferous Period removed carbon dioxide from the atmosphere in vast amounts. Today, the estimate is that carbon dioxide fell from about 1,500 PPM at the beginning of the Carboniferous to 350 PPM by the end, which is lower than today’s value. That tandem effect of sequestering carbon and freeing oxygen not only may have led to huge arthropods and amphibians, but also intensified . The idea that high oxygen levels led to those giants was first proposed more than a century ago and dismissed, but has recently come back into favor. Flying insects have the highest metabolisms of all animals, but they do not have diaphragmatic lungs as mammals have, or air sac lungs as birds have, and although they may have some way of actively breathing by contracting their tracheas, it is not the bellows action of vertebrate lungs. The for early insect gigantism is that high oxygen, as well as a denser atmosphere (the nitrogen mass would not have fallen, so increased oxygen would have added to the atmosphere’s mass), would have enabled such leviathans to fly, and the other is that flying insects got a head start in the arms race and could grow large until predators that could catch them evolved. The late Permian had an even larger dragonfly, when oxygen levels had crashed back down. The evolution of flight is another area of great controversy, and insects accomplished it long before vertebrates did. The general idea is that flight structures evolved from those used for other purposes. For insects, wings appear to have evolved from aquatic “oars,” and gills became lungs. Reptiles did not develop flight until the Triassic, and .
The first tree forests formed in the late Devonian, and bark is the great innovation that led to forming the Carboniferous’s vast coal deposits. Compared to modern trees, Carboniferous trees seemed to go overboard on bark, at least partly to discourage arthropods. Today’s trees generally contain at least four times as much wood as bark. Those early trees had about . trees dominated the Carboniferous rainforest and could grow 30 meters tall. Because it took more than a hundred million years for life to learn to break down lignin, that early lignin did not degrade via biological processes. The early Carboniferous was warm, even with a small ice cap at the South Pole, and Earth’s first rainforests appeared in the late Devonian and again proliferated in the Carboniferous. The Carboniferous lasted from about 360 mya to 300 mya and was the Golden Age of Amphibians, as the rainforest was largely global in extent and swamps abounded. Amphibians were the Carboniferous’s apex predators on land, and some reached crocodile size and acted like them.
Free Essays on The Most Memorable Day Of My Life - …
I always respected Dennis and Brian the most in the FE field, and I valued their integrity above all else. Their great hearts attracted me to them, not their talent, genius, or fame. I have written plenty about my days with and , and interested readers can discover more if they wish. I hope to convey what the learning experience of carrying their spears was like. My and comprised the kind of education that few survive for long. Although my education with Brian was far gentler, I learned important lessons from him. If not for my adventures, I would not have much worth saying. Even though much of this essay “merely” deals with mainstream science theory and data, . This essay is obviously not the work of a professional scientist, historian, or economist.
In this essay’s , I reviewed my journey and touched on Dennis Lee’s, who was my partner during my days of pursuing FE, and that chapter also mentioned amazing explorations. This chapter will dig a little deeper into our experiences. Our odysseys into alternative and free energy all began at about the same time: in 1973-1974, during the , which ended the . Mine started when my first professional mentor invented what was hailed as the , which he invented in about 1968 and began to patent just before the crisis, and it . During that furor, I , spent absorbing its art and culture, and began . Dennis is 12 years older than I am, and as I dreamed of changing the energy industry, he had his in the energy crisis's mayhem. Brian began his alternative energy pursuit around the same time, as he engaged in activism and .
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The appeared in North America in the late Eocene and early Oligocene, and in Europe in the late Oligocene. It might be amusing to consider, but cats and dogs are close cousins and . in the early Oligocene in North America about 34 mya, and in the late Oligocene about 25 mya. in the late Eocene and early Oligocene, and the in the Oligocene. The common ancestor of today’s sloths lived in the late Eocene; South American appeared in the late Oligocene. The may have begun in the Oligocene. The . By the late Eocene, the had appeared, and squirrels had appeared in North America.
Judith Wright Essay - 1084 Words - StudyMode
The Oligocene Epoch (c. 34 to 23 mya) was relatively cold. In the 1960s, a , the recovered nearly 20,000 cores from Earth’s oceans, and scientists had paradigm-shift learning experiences from studying those cores. One finding was that Antarctica developed its ice sheets far earlier than previously supposed, and the cores pushed back the initial ice sheet formation by 20 million years, ; the first Antarctic glaciers formed as early as 49 mya. The evidence included in sediments, which meant icebergs. The event that led to Antarctic ice sheets was the formation of the , which began to form about 40 mya and was firmly established by 34 mya, when the Antarctic ice sheets grew in earnest. The current’s formation was caused by Antarctica’s increasing isolation from Australia and South America, which gradually allowed an uninterrupted current to form that circled Antarctica and isolated it so that it no longer received tropical currents. That situation eventually turned Antarctica into the big sheet of ice that it is today. It also radically changed global oceanic currents. formed, which cooled the oceans as well as oxygenated its depths, and it comprises more than half of the water in today’s oceans. began forming around the same time.
South Korea In A Globalizing World
The (c. 5.3 to 2.6 mya) began warmer than , but was the prelude to today’s ice age, as temperatures steadily declined. An epoch of less than three million years reflects human interest in the recent past. Geologically and climatically, there was little noteworthy about the Pliocene (although the was created then), although two related events made for one of the most interesting evolutionary events yet studied. South America kept moving northward, and the currents that once in the Tethyan heyday were finally closed. The gap between North America and South America began to close about 3.5 mya, and by 2.7 mya the current land bridge had developed. Around three mya, the began, when fauna from each continent could raft or swim to the other side. South America had been isolated for 60 million years and only received the stray migrant, such as rodents and New World monkeys. North America, however, received repeated invasions from Asia and had exchanges with Europe and Greenland. North America also had much more diverse biomes than South America's, even though it had nothing like the Amazon rainforest. The ending of South America’s isolation provided the closest thing to a controlled experiment that paleobiologists would ever have. South America's fauna was devastated, far worse than European and African fauna were when Asia finally connected with them. More than 80% of all South American mammalian families and genera existing before the Oligocene were extinct by the Pleistocene. Proboscideans continued their spectacular success after leaving Africa, and species inhabited the warm, moist Amazonian biome, as well as the Andean mountainous terrain and pampas. The also invaded and thrived as a mixed feeder, grazing or browsing as conditions permitted. In came cats, dogs, camels (which became the ), horses, pigs, rabbits, raccoons, squirrels, deer, bears, tapirs, and others. They displaced virtually all species inhabiting the same niches on the South American side. All large South American predators were driven to extinction, as well as almost all browsers and grazers of the grasslands. The South American animals that migrated northward and survived in North America were almost always those that inhabited niches that no North American animal did, such as monkeys, (which survived because of their claws), and their small cousins (which survived because of their armor), , and (which survived because of their quills). The opossum was nearly eradicated by North American competition but survived and is the only marsupial that made it to North America and exists today. One large-hoofed herbivore survived: the . The (it weighed one metric ton!) survived for a million years after the interchange. , that , also survived and migrated to North America and lasted about a million years before dying out. In general, North American mammals were , which resulted from evolutionary pressures that South America had less of, in its isolation. They were able to outrun and outthink their South American competitors. South American animals made it past South America, but none of them drove any northern indigenous species of note to extinction.
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