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Because although there is evidence to support the claims, it isn't possible to prove evolution indefinately.
Evolution may refer to both the observed phenomenon and the theoretical framework explaining observations in terms of what we know of that phenomenon. Phenomena need no support, just verification. Theories aren't usually supported by other theories, but by observational data. Just so for evolutionary theory: it's supported by the observations in embryology, genetics, comparative genomics, palaeontology, ethology, zoology, microbiology, molecular biology, and so forth.
Intelligent design, Hovind Theory Added: The above are not scientific theories but more ideological assertions in nature. No positive evidence supports either assertion.
I believe you are referring to microevolution and macroevolution. These theories both support evolution, but each in their own way. Microevolution is the most common belief today. This states that evolution is happening so rapidly that we don't even notice it. The mutations needed for evolution happen so quickly and on such a small scale that we never realize it's happening until afterwards. Macroevolution is exactly the opposite. This states that the mutations take so long that we never notice it. Both theories, in fact, were proposed because people were asking why, if evolution actually did take place, we could never see it happening.
The vast majority of scientists support evolution. There is no longer any debate in the scientific community about whether evolution occurs, only the mechanisms in which evolution acts upon is debated.
The theory predicts that evolution will happen and in certain ways. The observed evolution makes this prediction correct. It also defines evolution as happening, and as such is perfect evidence in support of it.
Experiments.
use scientific evidence to support your answer
Theories don't support theories.Only evidence that comes from observation or experiment supports or demolishes theories.
There is not enough evidence to support these new theories. More tests and research needs to be carried out before these theories can be proved.
It is generally thought to support the Theory of Evolution.
Intermediate forms are predicted by evolutionary science in several ways. Their presence supports the theory of evolution.