Evolution means gradual change. Usually the word implies not just change but gradual improvement or progress as well. Nowadays the word is generally used to refer to a specific theory about life on Earth. According to this theory, 1. All (or nearly all)...

Perhaps no topic evokes a greater visceral reaction among both scientific and religious communities than that of the treatment of Darwinian evolution in Western society. On the one hand, scientists realize that this model of how the observed complexity...

Evolutionary Theory While the fixity of species was the generally accepted view before Charles Darwin, he was not the first to propose that evolution, understood as the transformation of one species into another, occurred. The ancient Greek philosopher...

The diverse forms of life on earth have emerged probably from a common source, through a process of evolution that has the following characteristics: The course of evolution does not always proceed along a straight path (for example, from simple to...

Plants, descended from aquatic green algal ancestors, first appeared on land more than 450 million years ago during or prior to the Ordovician period. This event preceded the colonization of land by four-footed animals (tetrapods), which occurred...

Learning is a biological adaptation, and like any other adaptation is the outcome of evolution by natural selection. Because it is acted on by natural selection, learning in different species of animals exhibits both descent with modification and...

Religion, Naturalistic Reconstructions Of In philosophy a naturalist is one who holds that there is nothing over and above nature. A naturalist is committed to rejecting traditional religion, which is based on beliefs in the supernatural. This does not...

After the theory of spontaneous generation was discredited, only religious explanations were offered to explain the origin of life. Alexander Oparin (1894-1980), an atheist, suggested that natural chemical reactions produced biological molecules that...

Darwinian evolution, that is, evolution through the accumulation of almost undetectable changes over millions of years, has been the mainstay of evolutionary theory since its formulation by Charles Darwin (1809-1882) and Alfred Wallace (1823-1913) in...

Evolution is an all-pervading concept in modern science applied to physical as well as biological processes. The phrase theory of evolution, however, is most commonly associated with organic evolution, the origin and evolution of the enormous...

Although evolution was not an altogether new topic, Charles Robert Darwin (1809-1882) brought it into the limelight in 1859 with the publication of his On the Origin of Species by Means of Natural Selection. His hypothesis that current species evolved...

Biological evolution is the change in the allele frequency of a gene in a population over time. That is to say some genetic change has happened in the population between generations. Only populations can evolve, not individuals. Individuals can not...

The conception that living organisms are changing or mutable originated in the thoughts of Empedocles, an ancient Greek philosopher (c. 490-430 B. C. E.). He drew on the theories of Greek philosophers preceding him to suggest a unitary view of the...

The concept of evolution first emerged in the early nineteenth century. Up until that time, the post-classical Western world had generally regarded the account of creation provided in the Biblical book of Genesis as literal fact. Thus, it was held that...

The concept of evolution first emerged in the early nineteenth century. Up until that time, the post-classical Western world had generally regarded the account of creation provided in the Biblical book of Genesis as literal fact. Thus, it was held that...

Evolution is the process of biological change over time. Such changes, especially at the genetic level are accomplished by a complex set of evolutionary mechanisms that act to increase or decrease genetic variation. Because of their rapid development...

Evolution is the process of biological change over time. Such changes, especially at the genetic level are accomplished by a complex set of evolutionary mechanisms that act to increase or decrease genetic variation. Evolutionary theory is the...

Evolution is the process of biological change over time. Such changes, especially at the genetic level are accomplished by a complex set of evolutionary mechanisms that act to increase or decrease genetic variation. Evolutionary theory is the...

Evolution is the process of biological change over time. Such changes, especially at the genetic level, are accomplished by a complex set of evolutionary mechanisms that act to increase or decrease genetic variation. Changes at the genetic level are...

Earth formed between 4.5 and 6 billion years ago. Conditions initially remained inhospitable for the potential development of life. By about 3.0 billion years ago, however, an atmosphere that contained the appropriate blend of nitrogen, oxygen, carbon,...

Evolution is the gradual, cumulative change over time of the characteristics of groups of organisms, in a heritable manner. Eventually, these minute changes add up to produce an individual that is markedly different from its distant ancestors, but...

Evolution is the gradual, cumulative change over time of the characteristics of groups of organisms in a heritable manner. Eventually, these minute changes add up to produce an individual that is markedly different from its distant ancestors, but...

Evolution is the gradual, cumulative change over time of the characteristics of groups of organisms, in a heritable manner. Eventually, these minute changes add up to produce an individual that is markedly different from its distant ancestors, but...

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