Полнотекстовый поиск:
Где искать:
только в названии
только в тексте
слова в тексте
только заголовок

Рекомендуем ознакомиться

Остальные работы->Реферат
This report is on a project undertaken to help an older gentleman named Mortimer who is seventy-seven years old. This project is intended to get Morti...полностью>>
Остальные работы->Реферат
The Progressive Era was a period in which the federal government increased its legislation and its grasp of the nation. There were three distinct piec...полностью>>
Остальные работы->Реферат
The Women of Brewster Place by Gloria Naylor is a classic novel highlighting the struggles of inner-city women. As they live and work, the reader is e...полностью>>
Остальные работы->Реферат
Saint-Simon wanted to see scientists at the top of the political structure. He proposed the idea of a scientific priesthood of the Religion of Newton....полностью>>

Главная > Реферат >Остальные работы

Сохрани ссылку на реферат в одной из сетей:


The process by which all living things have developed from primitive life forms through changes occurring over billions of years is evolution. All living things arose through a long history of changes formed by physical and chemical processes that are still taking place. It is possible that all organisms can be traced back to the origin of life from inanimate matter. Paleontology is the most direct proof of evolution because it studies life of the past. Approximately 2 million different species of organisms are now living, but at least 99.9 percent of the species that have ever lived are now in extinction and about 2 billion species have evolved during the past 600 billion years (Burkhardt 19).

One of the firsts to propose a general theory evolution was Pierre Louis de Maupertuis. His theory was that hereditary material, consisting of particles, was transmitted from parents to their offspring. Until the mid 19th century naturalists believed that each species was created separately by a supreme being or through spontaneous generation, the concept that organisms arose from the soil or water. Carolus Linnaeus, a Swedish naturalist who classified biological organisms, focused his attention on the similarities of certain species. There was speculation of a blood relationship between those species. From these questions and the rise of the new sciences of geology and paleontology arose the hypothesis that the life forms of the day evolved from earlier forms through a process of change. Also the extremely important discovery that different layers of rock showed different time periods and that each layer had a distinctive set of fossils of life forms that had lived in the past.

During the Devonian Period (390-340 million years ago) the Earth was largely barren of animal life. However, the seas were crowded with many invertebrates, cartilaginous and bony fish. A prominent bony fish, the Crossopterygii, possessed the ability to rise to the surface and gulp air. This fish was one of the first amphibians. What led the Crossopterygii to venture on to land is still under speculation by scientists. The Crossopterygians were crudley adapted for land existance but bacause they had no competitors they survived. They possessed

Скачать работу

Похожие работы:

  1. Краткая грамматика английского языка Долгина Е.А

    Реферат >> Астрономия
    ... today. Where is the salt? Pass me the pepper, please. f) ... a subject of scholarly research and discussion. It is ... two English variants of each of the following sentences using the pronouns each ... / saw the boy in the park. Seeing the boy in the park his mother ...
  2. The down of British History

    Лекция >> Иностранный язык
    ... a result of a long process of evolution, during which the monarchy’s absolute power has ... consists of an arithmetic paper, an English paper and an intelligence test ... research, work in London. Thousands of computers travel to central London each ...
  3. Dead Sea Scrolls Essay Research Paper Introduction

    Реферат >> Остальные работы
    ... fresh insights into the evolution of Rabbinic Judaism ... papyri found in Egypt over the last two ... Canonization refers to the process whereby certain books ... dates for each scroll; the date the hide was ... establish the Institute’s Dead Sea Scrolls Research Project. ...
  4. England Essay Research Paper England Latin Anglia

    Реферат >> Остальные работы
    ... England and the evolution of the territorial state, which was replacing the kinship structure ... of the Cistercians, led the rural expansion and became wealthy in the process. More ... and in the world.The Two Treatises of John Locke and his Essay Concerning ...
  5. Internet Protocols And Infra Structure Essay Research

    Реферат >> Остальные работы
    Internet Protocols And Infra Structure Essay, Research Paper Introduction: Network: Anything reticulated ... concerned with the evolution of the Internet architecture and the smooth operation ... beneath the root, as shown in the diagram below: The process of ...
  6. Progressive Stuff Essay Research Paper TRUTH AND

    Реферат >> Остальные работы
    ... 1997). The process of professionalization ... the evolution of the auditor’s certificate. The auditor’s certificate specifies the ... the claim. The consequences for the groups in each situation are different. In auditing, the ... theory and research. Journal of ...

Хочу больше похожих работ...