Evolution Is :: Science Biology Essays

Evolution Is Has the narrative of Mayr and his fellow naturalists—those evolutionists who include natural selection in their explanations and who comprise a strong majority of evolutionist voices today—now entered a sort of evolutionary stasis? Not yet. For example, consider Mayr's central theory of speciation as it applies to a creative species such as humans. There are cultural and creative aspects of our so-called "higher level" species that have the potential to perturb whether and how new species taxa might evolve from homo sapiens: mobility and its effect on isolation, technology applied to environmental and physiological conditions, artificial constraints on reproduction, social cultures, and our creative abilities. Whether our species is better equipped to survive or more likely to accelerate towards extinction may, in part, be determined by these factors and their interactions. Evolution is. Therefore, we are. The human species is an infinitesimally improbable out-come of countless, unrepeatable iterations of a process that itself is a fluke. To paraphrase the late naturalist Stephen J. Gould, erase the tape, have one player move a few feet to the left for good measure, do a retake, do a trillion trillion retakes, and nothing akin to homo sapiens is likely to emerge. Evolution is not intuitive, nor would any sane gambler bet on its odds. There are no "proofs," no conclusions based upon experimentation and testing. What we know about evolution derives from historical narrative—the evolutionary biologists' reconstruction of what might have happened. Their scenario has also evolved through iterations of accumulating, adapting, and eliminating ideas according to new findings, new observations, and new knowledge. In the process, the narrative's woof and warp have tightened. Gaps narrowed to the point that, in "What Evolution Is," biologist Ernst Mayr coul d proclaim, "Evolution is not merely an idea, a theory, or a concept, but is the name of a process in nature, the occurrence of which can be documented by mountains of evidence that nobody has been able to refute...It is now actually misleading to refer to evolution as a theory, considering the massive evidence that has been discovered over the last 140 years documenting its existence. Evolution is no longer a theory, it is simply a fact" [Mayr 275]. Central to this "simple fact" is the concept of speciation, which was developed in the 1930s by Dobzhansky and Mayr. According to them, allopatric speciation is contingent upon the spatial and temporal integrity of a population, a species taxon. Evolution Is :: Science Biology Essays Evolution Is Has the narrative of Mayr and his fellow naturalists—those evolutionists who include natural selection in their explanations and who comprise a strong majority of evolutionist voices today—now entered a sort of evolutionary stasis? Not yet. For example, consider Mayr's central theory of speciation as it applies to a creative species such as humans. There are cultural and creative aspects of our so-called "higher level" species that have the potential to perturb whether and how new species taxa might evolve from homo sapiens: mobility and its effect on isolation, technology applied to environmental and physiological conditions, artificial constraints on reproduction, social cultures, and our creative abilities. Whether our species is better equipped to survive or more likely to accelerate towards extinction may, in part, be determined by these factors and their interactions. Evolution is. Therefore, we are. The human species is an infinitesimally improbable out-come of countless, unrepeatable iterations of a process that itself is a fluke. To paraphrase the late naturalist Stephen J. Gould, erase the tape, have one player move a few feet to the left for good measure, do a retake, do a trillion trillion retakes, and nothing akin to homo sapiens is likely to emerge. Evolution is not intuitive, nor would any sane gambler bet on its odds. There are no "proofs," no conclusions based upon experimentation and testing. What we know about evolution derives from historical narrative—the evolutionary biologists' reconstruction of what might have happened. Their scenario has also evolved through iterations of accumulating, adapting, and eliminating ideas according to new findings, new observations, and new knowledge. In the process, the narrative's woof and warp have tightened. Gaps narrowed to the point that, in "What Evolution Is," biologist Ernst Mayr coul d proclaim, "Evolution is not merely an idea, a theory, or a concept, but is the name of a process in nature, the occurrence of which can be documented by mountains of evidence that nobody has been able to refute...It is now actually misleading to refer to evolution as a theory, considering the massive evidence that has been discovered over the last 140 years documenting its existence. Evolution is no longer a theory, it is simply a fact" [Mayr 275]. Central to this "simple fact" is the concept of speciation, which was developed in the 1930s by Dobzhansky and Mayr. According to them, allopatric speciation is contingent upon the spatial and temporal integrity of a population, a species taxon.