The Science Guys - Theories of Evolution :: essays research papers

Jean-Baptiste Lamarck (1744-1829)Today, the name of Lamarck is associated only when with a discredited theory of heredity, the "inheritance of acquired traits." However, Charles Darwin, Lyell, Haeckel, and other early organic evolutionists acknowledge him as a great zoologist and as a antecedent of evolution. To be fair to Lamarck, we should mention that since the time of Linnaeus, few naturalists had considered the invertebrates worthy of study. The news program "invertebrates" did not even exist at the time Lamarck coined it. The invertebrate collections at the Muse were enormous and rapidly growing, but poorly nonionised and classified. Although the professors at the Muse were theoretic all(prenominal)y equal in rank, the death chair of "insects and worms" was definitely the least prestigious. But Lamarck took on the enormous challenge of eruditeness -- and creating -- a new field of biology. The sheer number and diversity of invertebrates prove t o be both a challenge and a rich beginning of knowledge. What Lamarck actually believed was more complex organisms are not passively modify by their environment. Instead, a change in the environment causes changes in the postulate of organisms living in that environment, which in turn causes changes in their expression. Altered behavior leads to greater or lesser use of a given organize or organ use would cause the structure to increase in size over several generations, whereas disuse would cause it to shrink or even disappear. This rule -- that use or disuse causes structures to enlarge or shrink -- Lamarck called the "First integrity" in his book Philosophie zoologique. Lamarcks "Second Law" stated that all such changes were heritable. The result of these laws was the continuous, gradual change of all organisms, as they became adapted to their environments the physiological needs of organisms, created by their interactions with the environment, drive Lamarcki an evolution. Carl Linnaeus (1707-1778)Carl Linnaeus, also known as Carl von Linn or Carolus Linnaeus, is often called the Father of Taxonomy. His dodging for naming, ranking, and classifying organisms is still in wide use today (with many changes). Erusmus Darwin      He did discuss ideas that his grandson elaborated on sixty years later, such as how life evolved from a single common ancestor, forming "one living string". He wrestled with the question of how one species could evolve into another. Although some of his ideas on how evolution might occur are quite close to those of Lamarck, Erasmus Darwin also talked nearly how competition and sexual selection could cause changes in species