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Q: why is evolution considered a theory?
A: Evolution is any change across successive generations in the heritable characteristics of biological populations. [ Evolutionary processes give rise to diversity at every level of biological organisation, including species, individual organisms and molecules such as DNA and proteins.[1] Life on Earth originated and then evolved from a universal common ancestor approximately 3.7 billion years
ago. Repeated speciation and the divergence of life can be inferred from shared sets of biochemical and morphological traits, or by shared DNA sequences. These homologous traits and sequences are more similar among species that share a more recent common ancestor, and can be used to reconstruct evolutionary histories, using both existing species and the fossil record. Existing patterns of biodiversity have been shaped both by speciation and by extinction.[2] Charles Darwin was the first to formulate a scientific argument for the theory of evolution by means of natural selection. Evolution by natural selection is a process that is inferred from three facts about populations: 1) more offspring are produced than can possibly survive, 2) traits vary among individuals, leading to differential rates of survival and reproduction, and 3) trait differences are heritable.[3] Thus, when members of a population die they are replaced by the progeny of parents that were better adapted to survive and reproduce in the environment in which natural selection took place. This process creates and preserves traits that are seemingly fitted for the functional roles they perform.[4] Natural selection is the only known cause of adaptation, but not the only known cause of evolution. Other, nonadaptive causes of evolution include mutation and genetic drift.[5] In the early 20th century, genetics was integrated with Darwin's theory of evolution by natural selection through the discipline of population genetics. The importance of natural selection as a cause of evolution was accepted into other branches of biology. ]
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Original conversation
User: why is evolution considered a theory?

Weegy: Evolution is any change across successive generations in the heritable characteristics of biological populations. [ Evolutionary processes give rise to diversity at every level of biological organisation, including species, individual organisms and molecules such as DNA and proteins.[1] Life on Earth originated and then evolved from a universal common ancestor approximately 3.7 billion years ago. Repeated speciation and the divergence of life can be inferred from shared sets of biochemical and morphological traits, or by shared DNA sequences. These homologous traits and sequences are more similar among species that share a more recent common ancestor, and can be used to reconstruct evolutionary histories, using both existing species and the fossil record. Existing patterns of biodiversity have been shaped both by speciation and by extinction.[2] Charles Darwin was the first to formulate a scientific argument for the theory of evolution by means of natural selection. Evolution by natural selection is a process that is inferred from three facts about populations: 1) more offspring are produced than can possibly survive, 2) traits vary among individuals, leading to differential rates of survival and reproduction, and 3) trait differences are heritable.[3] Thus, when members of a population die they are replaced by the progeny of parents that were better adapted to survive and reproduce in the environment in which natural selection took place. This process creates and preserves traits that are seemingly fitted for the functional roles they perform.[4] Natural selection is the only known cause of adaptation, but not the only known cause of evolution. Other, nonadaptive causes of evolution include mutation and genetic drift.[5] In the early 20th century, genetics was integrated with Darwin's theory of evolution by natural selection through the discipline of population genetics. The importance of natural selection as a cause of evolution was accepted into other branches of biology. ]
Prinaker|Points 140|

User: how is radioactive dating important for providing evidence for evolution?

User: what is an index fossil?

Weegy: Index fossils (also known as guide fossils, indicator fossils or zone fossils) are fossils used to define and identify geologic periods (or faunal stages).
shifa saleheen|Points 9809|

User: How is DNA used as evidence for evolution?

User: why are vestigial structures not removed by natural selection?

User: What is the term for a preserved footprint left behind by an animal?

Weegy: Preserved footprint left behind by an animal is called trace fossil.
ghelee|Points 194|

User: Which would be a homologous structure to a human arm bone?

User: what is a vestigial structure?

Weegy: Vestigial Structures A structure or organ is vestigial if it has diminished in size or usefulness in the course of evolution. Vestigial structures are markers of evolutionary descent. [ For example, boa constrictors, which are descended from four-legged reptiles, grow tiny hind legs. ]
sipichapie|Points 4460|

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Asked 6/11/2012 5:56:32 PM
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What is speciation?
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Expert Answered
Updated 1/24/2016 11:48:02 PM
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Speciation is the formation of new and distinct species in the course of evolution.

Added 1/24/2016 11:48:02 PM
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