Evolution Vs. Creationism Biological Evolution or Evolutionary Term Paper

Evolution vs. Creationism

Biological evolution or evolutionary biology is genetic change in a population occurring from generation to another (O'Neill 2002). All life forms evolve and continue evolving from earlier species, and these life forms include human beings. Most biological scientists concur that the earliest life forms on earth evolved from chance natural occurrences 3 1/5 to 4 billion years ago. They agree that evidence for evolution comes from fossil records of change, the chemical and structural similarities of related life forms, the recorded genetic changes in living organisms for many generations (O'Neill) and the geographic distribution of these related species.

Fossil remains of animals and plants in sedimentary rock deposit prove and serve as records of past changes that occur through time and of the numerous varieties of living things. They also suggest that gaps or missing links in evolution are due only to lack of recorded data (O'Neill).

Living things share the same basic chemical and structural characteristics and highly complex organisms with billions of cells evolved from single-celled organisms through division (O'Neill). Another evidence is that 99% of the proteins, carbohydrates, fats and other molecules of living things are composed of only 6 out of 92 most common elements and that they inherit specific genetic combinations from their parents.

Most remarkably, the numerous types of proteins in living things are composed of only 20 kinds of amino acids and have only one DNA code, attesting to the basic molecular unity of life. Furthermore, living things obtain energy for growth, repair and reproduction from sunlight, by photosynthesis or indirectly by eating green vegetation and other organisms that consume this vegetation.

Moreover, vertebrates, or animals with internal skeletons, share the same types of body structures, which they inherited precisely from a common ancestor (O'Neill).Examples are human arms, the forelegs of dogs and cats, birds' wings and the flippers of whales and seals. Their similarities urge the belief that they share a common ancestry or they evolved due to similar natural processes (O'Neill).

Genetic changes also occur through generations. When a given population of organisms is unable to tolerate huge genetic changes, they die or become extinct. Charles Darwin, however, observed that there are individuals who would survive an environmental crisis and then reproduce (O'Neill), resulting in new genetic changes in the ensuing generations.

Major isolated areas have been observed to evolve their own distinct plant and animal communities. Examples are Australia's more than 100 species of kangaroos, koalas and marsupials and the absence of land mammals in Hawaii and New Zealand (O'Neill). This geographic distribution of living species is one more evidence of evolution.

It is widely held by evolutionists that evolution continues to occur today, although the specific evolutionary paths of some species remain speculative at present. But a lot more has been added to the collection of knowledge on evolution since the 19th century. Examples are the six processes that can operate independently or in cooperate to bring on evolution (O'Neill) and serve as basis of an overall theory of evolution - multiple causes, including Charles Darwin's concept of natural selection, Gregor Mendel's genetic inheritance experiments, and important 20th-century discoveries.

Creationism supporters sustain the Biblical account of Genesis, whereby God created the world as a single act approximately 6,000 years ago and that animals today had the same forms as they did when created (youdebate.com).

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