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Evolution is the change in the heritable characteristics of biological populations over successive generations. [1] [2] It occurs when evolutionary processes such as natural selection and genetic drift act on genetic variation, resulting in certain characteristics becoming more or less common within a population over successive generations. [3]
Evolution of the amniotic egg allows the amniotes to reproduce on land and lay shelled eggs on dry land. They did not need to return to water for reproduction nor breathing. This adaptation and the desiccation-resistant scales gave them the capability to inhabit the uplands for the first time, albeit making them drink water through their mouths.
Reconstruction: America's Unfinished Revolution, 1863–1877 is a historical non-fiction monograph written by American historian Eric Foner.Its broad focus is the Reconstruction Era in the aftermath of the American Civil War, which consists of the social, political, economic, and cultural changes brought about as consequences of the war's outcome.
Evolutionary ideas during the periods of the Renaissance and the Enlightenment developed over a time when natural history became more sophisticated during the 17th and 18th centuries, and as the scientific revolution and the rise of mechanical philosophy encouraged viewing the natural world as a machine with workings capable of analysis.
Adaptation is related to biological fitness, which governs the rate of evolution as measured by changes in allele frequencies. Often, two or more species co-adapt and co-evolve as they develop adaptations that interlock with those of the other species, such as with flowering plants and pollinating insects .
Adaptationism is an approach to studying the evolution of form and function. It attempts to frame the existence and persistence of traits, assuming that each of them arose independently and improved the reproductive success of the organism's ancestors.
Oct. 30—MOSES LAKE — Integrating and upgrading technology and how the Columbia Basin Project is evolving were the topics of discussion at a panel of irrigation district directors during the ...
The Reconstruction era was a period in United States history and Southern United States history that followed the American Civil War (April 12, 1861 – April 9, 1865) and was dominated by the legal, social, and political challenges of the abolition of slavery and the reintegration of the eleven former Confederate States into the