One of the most respected evolutionary biologists has defined biological evolution as follows: "In the broadest sense, evolution is merely change, and so is all-pervasive; galaxies, languages, and political systems all evolve."

{{Ummm, these examples do not contain
the vital ingredient we call "LIFE" !!!}}

Biological evolution ... is change in the properties of populations of organisms that transcend the lifetime of a single individual. The ontogeny of an individual is not considered evolution; individual organisms do not evolve. The changes in populations that are considered evolutionary are those that are inheritable via the genetic material from one generation to the next. Biological evolution may be slight or substantial; it embraces everything from slight changes in the proportion of different alleles within a population (such as those determining blood types) to the successive alterations that led from the earliest proto organism to snails, bees, giraffes, and dandelions." (Douglas J. Futuyma in Evolutionary Biology)

It is important to note that biological evolution refers to populations and not to individuals and that the changes must be passed on to the next generation. In practice this means that, "Evolution is a process that results in heritable changes in a population spread over many generations." This is a good working scientific definition of evolution; one that can be used to distinguish between evolution and similar changes that are not evolution.

Another common short definition of evolution can be found in many textbooks: "In fact, evolution can be precisely defined as any change in the frequency of alleles within a gene pool from one generation to the next." (Helena Curtis & N. Sue Barnes, Biology, 5th ed., p.974)

http://www.talkorigins.org/faqs/evolution-fact.html - Biologists consider the existence of biological evolution to be a fact. It can be demonstrated today and the historical evidence for its occurrence in the past is overwhelming. However, biologists readily admit that they are less certain of the exact mechanism of evolution; there are several theories of the mechanism of evolution....

Moreover, "fact" doesn't mean "absolute certainty"; there ain't no such animal in an exciting and complex world. The final proofs of logic and mathematics flow deductively from stated premises and achieve certainty only because they are NOT about the empirical world. Evolutionists make no claim for perpetual truth....

http://www.talkorigins.org/faqs/faq-intro-to-biology.html - The English moth, Biston betularia, is a frequently cited example of observed evolution [evolution: a change in the gene pool]. In this moth there are 2 color morphs, light and dark. H. B. D. Kettlewell found that dark moths constituted less than 2% of the population prior to 1848. The frequency of the dark morph increased in the years following. By 1898, the 95% of the moths in Manchester and other highly industrialized areas were of the dark type. Their frequency was less in rural areas. The moth population changed from mostly light colored moths to mostly dark colored moths. The moths' color was primarily determined by a single gene [gene: a hereditary unit]. So, the change in frequency of dark colored moths represented a change in the gene pool [gene pool: the set all of genes in a population]. This change was, by definition, evolution.

The increase in relative abundance of the dark type was due to natural selection. The late 1800s was the time of England's industrial revolution. Soot from factories darkened the birch trees the moths landed on. Against a sooty background, birds could see the lighter colored moths better and ate more of them. As a result, more dark moths survived until reproductive age and left offspring. The greater number of offspring left by dark moths is what caused their increase in frequency. This is an example of natural selection.

...The process of evolution can be summarized in 3 sentences: Genes mutate [gene: a hereditary unit]. Individuals are selected. Populations evolve.... The word evolution has a variety of meanings. The fact that all organisms are linked via descent to a common ancestor is often called evolution. The theory of how the first living organisms appeared is often called evolution. This should be called abiogenesis. And frequently, people use the word evolution when they really mean natural selection -- one of the many mechanisms of evolution.

...Selection is not a force in the sense that gravity or the strong nuclear force is. However, for the sake of brevity, biologists sometimes refer to it that way. This often leads to some confusion when biologists speak of selection "pressures." This implies that the environment "pushes" a population to more adapted state. This is not the case. Selection merely favors beneficial genetic changes when they occur by chance -- it does not contribute to their appearance.

So the above quotes refer to an all-pervasive, unknown process whose 'exact' (what's with "exact") mechanism is (to put it mildly) uncertain.

Science (& biological evolution) CANNOT disprove the existence of God. However, scientific research & experiments have discovered design & complexity, minuteness & colossal size / distance, beyond comprehension.

that perhaps split into 11 dimensions
& birthed multiple theories (were up to M :-)
strung together with super-symmetry & chalk;

that perhaps came from one force that divorced into
electric & magnetic forces, & strong & weak nuclear forces & the troublesome, mind-boggling, weakling force of the gravity of the situation;

that somehow, resulted in the pooling of caustic chemicals
on a VERTIGO-FREE Earth:

• (that spins on its axis every 24 hours @ 331 miles / hr) ~ (that spins around a hot sun every year @ 66,600 miles / hr)
• (that wobbles on its axis, which shifts the pole around on a 26,000-year cycle)
• (that spins around in a private galaxy @ 43,000 miles / hr)

that conveniently & vitally has an abundant supply of a miraculous life-sustaining substance called WATER (with hot / cold, & sweet / salty faucets) & found in liquid, solid, & gaseous states, that is composed of 2 parts of highly explosive hydrogen & 1 part necessary-for-combustion oxygen),

that conveniently & fortunately & inexplicably formed into a life-giving, recyclable cycle;

that conveniently & vitally has an abundant supply of a miraculous substance called OXYGEN;

that is also conveniently perfectly-spaced & ozone-shielded from a violent but vital heat & light source;

that produced living matter via an UNKNOWN, "all-pervasive" process or mechanism that "merely" resulted in heritable changes in ALL populations spread over many generations;

that was then aided by the tri-part mother (Nature) of all obnoxious, nagging FORCES
(i.e. "natural selection, mutations, & environmental pressures" -- a.k.a. unguided chance ad infinitum, impossible flukes, & bad-hair days / months / years - & millions of them!!!);

that left nothing alone, but naggingly pushed ALL living things to increasingly more complex states (oooops... except for the "How Come?" conundrum -- coelacanth fish, Gingko trees, crocodiles, horseshoe crabs, & cockroaches, etc.),

to keep on going & going in spite of colossal changes in environment, eon after eon -- all the while making sure that male & female variations simultaneously appeared (in continuous perfect-working-order) & with the ability to combine inheritable DNA, & somehow give birth to helpless offspring that could grow from miniature to gigantic proportions;

to become part of a simultaneous, self-sustaining, co-dependant, abundant, varied, colourful, age-appropriate food-chain;

with the icing-on-the-cake bonus of multiple special poisons & sugars to cater to all tastes,

with the only drawback being the formation of MORTALS (with a very flexible internal moral code),

inclined to greed, pride, arrogance, & self-centredness,

combined with a proneness to verbal, physical, sexual & environmental abuse,

but capable of random acts of kindness & love,

curiously full of emotions & memory,

& endowed with a mathematical ability to build bridges & keep score;

ironically able to repent & change because of a universal consciousness of sin, & GOD. :-)