what was darwins theory on eveloution?

Answer 1

Darwin's Theory of Natural Selection, in a nutshell:

There are three observations about life
1) Variation: Individuals of a species are not all identical.
2) Competition: More individuals are born than can possibly survive to reproduce.
3) Inheritance: Individuals pass on traits to their offspring.
Given these three things, those individuals in a species that have traits that help them survive better and produce more offspring, will pass those very traits on to those offspring. So in this way, beneficial traits become more frequent a population, and produce an overall change in the species over time.

That's it.

As for the creation of new species: If two subpopulations of a species get separated for long enough, then they will change in separate directions, and will eventually lose the ability to interbreed, resulting in (now) two separate species that will continue to change (evolve) in different directions.

The catchphrase "survival of the fittest" summarizes this idea ... but use it with caution. It's not just about "surviving" but "surviving to reproduce." For example, a peacock's tail doesn't really help him "survive" better ... in fact it probably makes him an easier prey for predators ... but it does attract the ladies. So it makes those individuals with the flashiest tail more "fit" then their homelier cousins.

-------------- A warning about 'tiffany g's answer ---------------

Be careful with answers like 'tiffany g' who copy-paste web pages instead of giving you a link to them, and without giving you the source, so you can check it out. She is copying from the web-site allaboutscience.org, a thinly disguised Christian/Creationist site.

My objection is not with people presenting the Creationist side ... but rather the attempt to hide that fact. For example, it is deliberately misleading for a site to call itself "allaboutscience.org" when it does not address science topics in general, but only topics like the Big Bang, Evolution, and evidence for the existence of Jesus. (Watch out for "allaboutphilosophy.org" as well.)

As a glaring example of intellectual dishonesty, the citation/page finishes with Darwin's famous quote about the eye ... famous because it is always quoted out of context and omits Darwin's very next sentence. Darwin did indeed write that the evolution of the eye "seems, I freely confess, absurd in the highest degree." (Note the word "seems".) But then Darwin continues ... "Yet reason tells me, that if numerous gradations from a perfect and complex eye to one very imperfect and simple, each grade being useful to its possessor, can be shown to exist; if further, the eye does vary ever so slightly, and the variations be inherited, which is certainly the case; and if any variation or modification in the organ be ever useful to an animal under changing conditions of life, then the difficulty of believing that a perfect and complex eye could be formed by natural selection, though insuperable by our imagination, can hardly be considered real." (See second source, Darwin, Ch. 6.)

In other words, Darwin immediately refutes the "irreducible complexity" argument, by pointing out that all we need to do is show that the eye can come about through small, incremental changes that each confers a small advantage, no matter how small. Every single case of "irreducible complexity" yet offered by Creationists has always been shown (usually quite easily) to be fully "reducible."

Creationists love to quote out-of-context from Darwin's Chapter 6, because this is the chapter where Darwin considers possible objections or "difficulties" with the theory, and then refutes them. The Creationists love to quote Darwin's own-words description of the "difficulty", but then omit his refutation. This is to present the lie that Darwin was baffled by these "difficulties", or was sadly confessing defeat or even a lack of confidence in his theory. He was saying precisely the opposite.

So, sorry about the lengthy digression ... but underhanded intellectual tactics need to be addressed.

Answer 2

Put in simplest terms, naturally occuring genetic variation gives some species, and some members of species a competitive advantage over others. Call these variations ADAPTATIONS, and environmental factors NATURALLY SELECT for organisms that have these adaptations, and select AGAINST organisms that do not have these adaptations. Thus, those that survive (the fittest) pass these adaptations on to their offspring, and those that do not have the adaptations, die off. Keep in mind this selection takes many many many years.

Answer 3

it says "Survival of the fittest"..., that is..., those individuals, species..., are selected for survival who could fit it via adapting to the environment. Although Darwinsm is actually based on concept of "natural selection" that it modification of individuals over many successive generations, via, natural means.

but he was unable to explain concept of "variation" and "gene transmission".
u can look for the salient features in any book on evolution.

Answer 4

That all creatures, large and small; on land, sea and sky; mammals birds, reptiles, amphibians, even people can trace their ancient origins back to an improbable alien zit.

Answer 5

Pick up a textbook, don't come asking us to explain theories to you which would take forever.

Answer 6

Complex organisms changed from more simple organisms.

Answer 7

Here i got this for ya explaining all the of it hope this helps you out
Darwin's Theory of Evolution - The Premise
Darwin's Theory of Evolution is the widely held notion that all life is related and has descended from a common ancestor: the birds and the bananas, the fishes and the flowers -- all related. Darwin's general theory presumes the development of life from non-life and stresses a purely naturalistic (undirected) "descent with modification". That is, complex creatures evolve from more simplistic ancestors naturally over time. In a nutshell, as random genetic mutations occur within an organism's genetic code, the beneficial mutations are preserved because they aid survival -- a process known as "natural selection." These beneficial mutations are passed on to the next generation. Over time, beneficial mutations accumulate and the result is an entirely different organism (not just a variation of the original, but an entirely different creature).

Darwin's Theory of Evolution - Natural Selection
While Darwin's Theory of Evolution is a relatively young archetype, the evolutionary worldview itself is as old as antiquity. Ancient Greek philosophers such as Anaximander postulated the development of life from non-life and the evolutionary descent of man from animal. Charles Darwin simply brought something new to the old philosophy -- a plausible mechanism called "natural selection." Natural selection acts to preserve and accumulate minor advantageous genetic mutations. Suppose a member of a species developed a functional advantage (it grew wings and learned to fly). Its offspring would inherit that advantage and pass it on to their offspring. The inferior (disadvantaged) members of the same species would gradually die out, leaving only the superior (advantaged) members of the species. Natural selection is the preservation of a functional advantage that enables a species to compete better in the wild. Natural selection is the naturalistic equivalent to domestic breeding. Over the centuries, human breeders have produced dramatic changes in domestic animal populations by selecting individuals to breed. Breeders eliminate undesirable traits gradually over time. Similarly, natural selection eliminates inferior species gradually over time.

Darwin's Theory of Evolution - Slowly But Surely...
Darwin's Theory of Evolution is a slow gradual process. Darwin wrote, "…Natural selection acts only by taking advantage of slight successive variations; she can never take a great and sudden leap, but must advance by short and sure, though slow steps." [1] Thus, Darwin conceded that, "If it could be demonstrated that any complex organ existed, which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down." [2] Such a complex organ would be known as an "irreducibly complex system". An irreducibly complex system is one composed of multiple parts, all of which are necessary for the system to function. If even one part is missing, the entire system will fail to function. Every individual part is integral. [3] Thus, such a system could not have evolved slowly, piece by piece. The common mousetrap is an everyday non-biological example of irreducible complexity. It is composed of five basic parts: a catch (to hold the bait), a powerful spring, a thin rod called "the hammer," a holding bar to secure the hammer in place, and a platform to mount the trap. If any one of these parts is missing, the mechanism will not work. Each individual part is integral. The mousetrap is irreducibly complex. [4]

Darwin's Theory of Evolution - A Theory In Crisis
Darwin's Theory of Evolution is a theory in crisis in light of the tremendous advances we've made in molecular biology, biochemistry and genetics over the past fifty years. We now know that there are in fact tens of thousands of irreducibly complex systems on the cellular level. Specified complexity pervades the microscopic biological world. Molecular biologist Michael Denton wrote, "Although the tiniest bacterial cells are incredibly small, weighing less than 10-12 grams, each is in effect a veritable micro-miniaturized factory containing thousands of exquisitely designed pieces of intricate molecular machinery, made up altogether of one hundred thousand million atoms, far more complicated than any machinery built by man and absolutely without parallel in the non-living world." [5]

And we don't need a microscope to observe irreducible complexity. The eye, the ear and the heart are all examples of irreducible complexity, though they were not recognized as such in Darwin's day. Nevertheless, Darwin confessed, "To suppose that the eye with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest degree." [6]

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Answer 8

if you dont use it ,you will loose it. monkey see,monkey do. & dont monkey with another monkeys monkey!