This website uses cookies to ensure you have the best experience. Learn more

History Of The Environment Essay

2203 words - 9 pages

What is the most significant set of theories that explain the evolutionary history of our natural world and ongoing environmental change?

The origin of life and earth is still one of the greatest mysteries scientists have yet to solve. Modern day science and technology allow us to make theoretically correct assumptions about the past. According to research, it is evident that the earth’s environment and life have been evolving since the beginning of time, which is still evident today as ecosystems and environments continue to change. Three theories that help explain the evolutionary history of our natural world and ongoing environmental change include natural selection, neutral theory of ...view middle of the document...

However, with time the environment began to change, oxygen began to accumulate in the atmosphere. This change was catastrophic for primitive bacteria; the build-up of oxygen was poisonous for early anaerobic life forms. “This early oxygen crisis, however, created an opportunity and led to important new evolutionary changes as life responded to this challenge with metabolic innovations that made use of the newly-available oxygen. Organisms evolved which used oxygen in their metabolic cycles to get more energy out of their food—twenty times more than anaerobic organisms get.” (Mojzsis, 2001) Life on earth experienced a colossal change as primitive bacteria began to disappear and multi-cellular aerobic organisms began to emerge. The significance of aerobic bacteria appearing during the same time as the shift in oxygen levels supports the importance of natural selection and the role it plays in evolution. Natural selection, formulated by Charles Darwin and Alfred Russel Wallace, is the theory that there is constant competition for survival in nature and life forms with the best ability to adapt to the changing environment continue to survive and populate the environment. During this time photosynthetic life evolved to incorporate oxygen in its metabolic cycle and therefore was able to survive the changes occurring in the environment however anaerobic life forms could not perform the same function of adaptability leading to a catastrophic decrease in their population. Another example that helps demonstrate natural selection’s importance in the evolution of life is the event of Snowball Earth. During the Cryogenian Period temperatures fell to -75 degrees Celsius and the earth was completely covered in glaciers. During this event majority of life forms that had evolved over 3 billion years were unable to adapt and died out except for extremophiles, more specifically cyanobacteria, a type of bacteria that is resistant and adaptive to tremendous environmental stress. Scientists believe Snowball Earth to be the event triggering diversity of life. Natural selection is one of the reasons vastly different life forms have occupied earth’s environments since the Archean Eon.
In addition to natural selection, neutral theory of molecular evolution also contributes to understanding the evolutionary history of our natural world. Neutral theory proves that gene variations are a result of mutations within a population independent from natural selection. Author Motoo Kimura (2003) explains “According to the neutral theory, the overwhelming majority of evolutionary changes at the molecular level, such as DNA base substitutions and amino acid replacements, are caused not by Darwinian natural selection but by random fixation of selectively neutral or very nearly neutral mutants under continued mutation pressure.” In other words, small mutations that occur over time contribute to the evolution of life however, the environment is not an influencing factor in the changes...

Other Papers Like History Of The Environment

The History Of Computers Essay

842 words - 4 pages history The History of Computer By Robert B Enea The history of the computer. The father of the computer is Charles Babbage he made the design for the computer that we use today. In 1940 the colossus was completed by Tommy Flowers and was used in War World two to be a code breaker which helped us win the war. In 1950 -1960 computer mainframes were installed in school, business and government. In 1976 the Internet was made to transfer data

The History Of History Essay

633 words - 3 pages don't, you've misread the question. You'll be surprised how often they don't agree. Think before you write: Make a brief outline for each question Number the items in the order you will discuss them Get right to the point State your main point in the first sentence Use your first paragraph to provide an overview of your essay. Use the rest of your essay to discuss these points in more detail. Back up your points with specific information

Environment

276 words - 2 pages Environment Environment means the surroundings. Land, water, air, plants, animals, solid wastes and other things that are surrounding us constitute our environment. Man and environment are closely intertwined with each other, to maintain a balance or equilibrium in nature. Different groups of people working in different areas express it in various ways. When physical scientists talk about environment they generally refer to the physical

The History Of Alcohol

399 words - 2 pages distilled drinks. Fermented drinks contain from five percent to twenty percent ethyl alcohol. Distilled contains twelve percent to fifty-five percent or more ethyl alcohol. The consumption of beverages containing alcohol has been practiced in all parts of the world for thousands of years. The first alcoholic beverages were fermented. Scenes showing fermentation appear on pottery made in Mesopotamia as early as 4200 B.C. Mankind early discovered

Prison Environment

330 words - 2 pages Prison Environment Dana Garlington CJS/230 June 29, 2012 Douglas Brinkley Prison Environment A prison environment is a place where inmates are physically confined and deprived of a range of personal freedoms (Foster, 2006). The prison environment influences the institutional management and custody by the growing population and the gangs within the facility. Overcrowding aggravates the natural conflicts that rely within the prisons

Business Environment

1877 words - 8 pages Regular Assignment 1 Module: The Business Environment Tutor: Steve Tidball Submission Date: 19th September 2013 Confidentiality: I have read, understand and adhere to the KOL Confidentiality Policy. Click here to access the KOL Confidentiality Policy. Academic Integrity Statement: I have read and understood the Academic Integrity guidelines for Kaplan Open Learning and the University Of Essex, and declare that this assignment

Business Environment

584 words - 3 pages |Unit Number and Name: |Unit 1 The Business Environment | |Unit Code: |D/502/5409 |Credit Value: |10 | |QCF Level: |BTEC National |Guided Learning Hours: |60

Internal Environment

913 words - 4 pages provides the employees with a list of items the mystery shoppers will be checking. If employees feel that the only purpose of a disguised shopper program is to report poor service and reprimand them, the program will not fulfill its full potential. Marketing Analysis (S.W.O.T Analysis) SWOT analysis can be dividing into internal, external Environment and positive, negative aspects. Internal environment would be strengths and weaknesses, strengths

Regulatory Environment

374 words - 2 pages Regulatory Environment Employment Law Kudler Fine Foods has an interest in expanding its services into offering catering. With this expansion the need for additional staff becomes more necessary. There will be a lot of employment regulations to consider when undertaking new employees. The laws protecting the employer-employee relationship are too numerous to name and as stated by Mallor (2003), “By now, however, such rules and

Business Environment

1036 words - 5 pages providing cleaning agents that are environmentally friendly and aesthetically pleasing to ordinary consumers. This company is socially responsible on two fronts. First, they are taking care of the environment. The cleaning agents that they use in their products are safe for the environment, biodegradable, and are tested on flowers not animals. Even their bottles are made for 100% recycled material. Secondly, they have made a product that is

How Does Knowledge Of The Foundations And History Of Nursing Provide A Context In Which To Understand Current Practice? Identify At Least Three Trends In Nursing Practice Demonstrated By The...

323 words - 2 pages How does knowledge of the foundations and history of nursing provide a context in which to understand current practice? Identify at least three trends in nursing practice demonstrated by the interactive timeline. How have these trends influenced your perspective of nursing practice? To understand the current practice of nursing, one must understand its history. Nursing is an art. One must have a passion for it. To be a nurse, one has to

Related Essays

Warming Of The Environment Essay

2287 words - 10 pages Warming of the Environment Joseph Nicholas Sr. Warming Of the Environment Wabash River Watershed The Wabash River drainage locale encloses and surrounds a number of huge cities. These include Indianapolis and the great western region of Fort Wayne. Other cities integrated in the region are Bloomington, Muncie, Lafayette, Anderson and Terre Haute. It is important to posit that this watershed also comprises majority of Indiana’s primary farm

The Constancy Of The Internal Environment

1535 words - 7 pages very critical to define the concept of physiology as a subject different from the applications of chemistry and physics. Bibliography Bernard, C., 1865. Introduction à l’étude de la médecine expérimentale.. Paris, France: J. B. Baillière. Gross, C. G., 1998. Claude Bernard and the Constancy of the Internal Environment. History of Neuroscience, pp. 380-384. Magner, L. N., 2002. A History of the Life Sciences, Revised and Expanded. 3rd Revised ed

Impacts Of Human Behavior On The Environment

1213 words - 5 pages RUNNING HEAD: Impacts of Human Behavior on the Environment 1 Impacts of Human Behavior on the Environment Psy 460 Impacts of Human Behavior on the Environment 2 Environmental psychology is the study of the link between human behavior, the direct impact on the environment, and the psychology of humans. The physical or manmade environment such as

Discuss Whether The Current International Regulatory Environment For The Auditing Profession Is Robust Enough To Ensure That The External Auditors Of Listed Companies Provide Reports To Owners And...

2816 words - 12 pages Discuss whether the current international regulatory environment for the auditing profession is robust enough to ensure that the external auditors of listed companies provide reports to owners and investors which are sufficiently independent to serve the public interest. Introduction As we will discover, the topic posed above is a complex one, which has many arguments both in favour and against the stability of the present regulatory