Largest-scale trends in evolutionThe history of life on Earth seems to show a clear trend; for example, it seems intuitive that there is a trend towards increasing complexity in living organisms. More recently evolved organisms, such as mammals, appear to be much more complex than organisms, such as bacteria, which have existed for a much longer period of time. However, there are theoretical and empirical problems with this claim.
Teleology in biologyTeleology in biology is the use of the language of goal-directedness in accounts of evolutionaryadaptation, which some biologists and philosophers of science find problematic. The term teleonomy has also been proposed. Before Darwin, organisms were seen as existing because God had designed and created them; their features such as eyes were taken by natural theology to have been made to enable them to carry out their functions, such as seeing.
EvolutionEvolution is the change in the heritable characteristics of biological populations over successive generations. It happens when individuals in a population vary in their genetic characteristics and in the numbers of their surviving offspring. Mutation introduces new genetic variation, and processes such as genetic drift, gene flow, and natural selection result in some genetic variants becoming more or less common over time.
Evolution of biological complexityThe evolution of biological complexity is one important outcome of the process of evolution. Evolution has produced some remarkably complex organisms – although the actual level of complexity is very hard to define or measure accurately in biology, with properties such as gene content, the number of cell types or morphology all proposed as possible metrics.
Theodor EimerGustav Heinrich Theodor Eimer (22 February 1843 – 29 May 1898) was a German zoologist. He was a popularizer of orthogenesis, a form of directed evolution through mutations that made use of Lamarckian principles. Life and workEimer was born in Stäfa, Switzerland, where his father, who had taken refuge following an attempted coup against the German Confederation in Frankfurt in 1833, practiced medicine. Eimer's mother, Albertine Pfenniger, was Swiss.
Jean-Baptiste LamarckJean-Baptiste Pierre Antoine de Monet, chevalier de Lamarck (1 August 1744 – 18 December 1829), often known simply as Lamarck (; French:), was a French naturalist, biologist, academic, and soldier. He was an early proponent of the idea that biological evolution occurred and proceeded in accordance with natural laws. Lamarck fought in the Seven Years' War against Prussia, and was awarded a commission for bravery on the battlefield.
OrganismAn organism is any living thing that functions as an individual. Such a definition raises more problems than it solves, not least because the concept of an individual is also difficult. Several criteria, few of which are widely accepted, have been proposed to define what constitutes an organism. Among the most common is that an organism has autonomous reproduction, growth, and metabolism. This would exclude viruses, even though they evolve like organisms.
HypothesisA hypothesis (pl.: hypotheses) is a proposed explanation for a phenomenon. A scientific hypothesis must be based on observations and make a testable and reproducible prediction about reality, in a process beginning with an educated guess. If a hypothesis is repeatedly independently demonstrated by experiment to be true, it becomes a scientific theory.
List of superseded scientific theoriesThis list includes well-known general theories in science and pre-scientific natural history and natural philosophy that have since been superseded by other scientific theories. Many discarded explanations were once supported by a scientific consensus, but replaced after more empirical information became available that identified flaws and prompted new theories which better explain the available data.Wilhelm HaackeJohann Wilhelm Haacke (23 August 1855 – 6 December 1912) was a German zoologist born in Clenze, which is now Lower Saxony, who served as Director of the South Australian Museum in Adelaide from 1882 to 1884.
Henri BergsonHenri-Louis Bergson (; French: [bɛʁksɔn]; 18 October 1859 – 4 January 1941) was a French philosopher who was influential in the traditions of analytic philosophy and continental philosophy, especially during the first half of the 20th century until the Second World War, but also after 1966 when Gilles Deleuze published Le Bergsonisme.
Pierre Teilhard de ChardinFrench philosopher and Jesuit priest (1881–1955)Pierre Teilhard de Chardin, S.J. (French:; 1 May 1881 – 10 April 1955) was a French Jesuit priest, scientist, paleontologist, philosopher, mystic and teacher. He investigated the theory of evolution from a perspective influenced by Henri Bergson and Christian mysticism, writing multiple scientific and religious works on the subject.*As an Amazon Associate I earn from qualifying purchases.