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Because while we can trace the APPARENT path of evolution yielding the species we see around us, in most instances the transition via evolution is implied, not observed. No one was around to observe when most of the evolutionary splits are believed to have occurred so no one documented them to establish as a known fact that that was how the split occurred. In fact there are quite a few instances where scientists have changed their views on which ancestor a particular species branched off from (usually based on further discoveries).

Also - theories remain theories until proven via experiments. It's rather difficult to craft an experiment to test natural evolution over any human time scale, although a limited number of experiments have been conducted via forced evolution of some species with very short life cycles.

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6y ago
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3mo ago

In science, a theory is a well-substantiated explanation based on evidence and observations. Evolution is referred to as a theory because it is supported by substantial evidence from various fields such as Paleontology, genetics, and comparative anatomy. It explains the diversity of life on Earth and how species change over time through natural selection.

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Q: Why is an evolution refered as a theory?
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Related questions

What is the difference between the theory of language and evolution?

Theory of evolution refers to animals and plants evolution along the time. Language evolution is another issue, not entirely related to the theory of evolution. It follows the theory of evolution on some way but it is related to culture evolution, not to the physical attributes evolution.


What was the last scientific theory to challenge the theory of evolution?

One of the most recent scientific theories to challenge the theory of evolution is the theory of Intelligent Design. Intelligent Design proposes that certain features of the universe and living organisms are best explained by an intelligent cause rather than natural selection. However, Intelligent Design is not widely accepted within the scientific community as it lacks empirical evidence and is considered unscientific. The theory of evolution, on the other hand, is supported by a vast amount of scientific evidence from various fields such as genetics, paleontology, and comparative anatomy.


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Evolution is an observed and observable fact. The theory of evolution by natural selection explains many things about evolution. The theory generates testable hypothesis, as any good theory does. Remember, theory is the highest concept in science.


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There are many books that describe the theory of evolution. For example, there is a book called Evolution: The Remarkable History of a Scientific Theory.


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the most prevalent theory of evolution is called natural selection.


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The ISBN of The Theory of Evolution is 0-14-020433-4.


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