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Is evolution real.

  1. Jul 8, 2004 #1
    can you bio pple help me. My brother and I were having a discussion, and we cannot resolve weather the humans and species in the world today actually evolved from other beings. I believe that the other species did, but I do not believe that for humans. Any help would be great.
     
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  3. Jul 8, 2004 #2

    Monique

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    So why is it that other species could have evolved from other beings, but humans couldn't have?
     
  4. Jul 8, 2004 #3

    Gokul43201

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    There is absolutely no doubt (among the scientific community) that humans evolved from apes.

    Monique, you know that's a moot question. Clearly there is a religious opposition to the idea of evolution of man, since "man was made in the image of God", and so, is special. Other creatures are not so special.
     
  5. Jul 9, 2004 #4
    Let me rephrase that right quick.... "There is absolutely no doubt (among the scientific community) that humans and apes evolved from a common ancestor."
     
  6. Jul 9, 2004 #5

    Phobos

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    Hi Nenad
    There is a mountain of scientific evidence supporting the evolution of life on Earth, including humans. If you have a specific question, we could probably discuss that in detail, but otherwise your question so far is very broad and you'll probably need to do some reading.

    You could start here which describes several likely ancestral species of modern humans...
    http://www.talkorigins.org/faqs/homs/species.html
    The link also provides examples of fossils from these species and you can see the shift in anatomy over time.

    Also note that we can directly observe small-scale evolution in many species.
    Larger degrees of evolution are evident over recorded history (e.g., agriculture).
    Even larger scales of evolution (which go beyond our recorded history) are evident from fossil evidence, genetic evidence, etc.

    There is a lot of information about it, so be prepared to study. Also watch out for the multitude of websites that argue against evolution. Their arguments may seem to make sense at first (not always) but they don't stand up when you actually check them against the scientific data.
     
  7. Jul 9, 2004 #6

    Monique

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    Moot questions are asked to start discussions, right? :rolleyes:

    As Phobos said, we need to know what Nenad is thinking in order to debate it.
     
  8. Jul 12, 2004 #7

    Phobos

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    There goes another one! :biggrin:
     
  9. Jul 12, 2004 #8
    Show me something that suggests humans didn't come from apes please. As far as I know, there were already apes around when humans evolved, and we came from a sort of tree-dwelling ape, simmilar to a Chimpanzee, which was forced onto the grasslands, needed to stand up to see over the grass etc.
     
  10. Jul 12, 2004 #9
    Clearly Evolution is just a THEORY. It has not, and cannot be proven to be FACT. What does it matter where humans and other life forms came from they are here, and so are you. As for me and my beliefs, I'm Christian, and I believe that GOD created everything. But again that's my belief. You are always free to believe that evolution is responsible for the life here on Earth. We may never fully understand and know the origin of life on Earth. I do find it strangely uncanny how apes and humans favor each other, but that isn't credible evidence to support that we derived from the same "common ancestor." Yes, I also know that they say that we share some 98% of DNA contents with chimpanzees, but that too, means nothing. DNA is just molecule made up universal components. Science is a tough thing to swallow down. But it is mainly built on rationalizing ideas in our own human intellectual capacity. Something I believe is quite limited at the moment. As far as what is truth or not, we may never know it. It is up to the individual to accept evolution as truth or THEORY. Yes, evolution is a "real" good THEORY! :biggrin:
     
  11. Jul 12, 2004 #10

    iansmith

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    CyrusMC how do you define theory?

    In science theory is define as a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena; "theories can incorporate facts and laws and tested hypotheses"; "true in fact and theory".

    Evolution has been tested and pass. It is true.

    Also do not confuse evolution and abiogenesis. Evolution is a theory that explain how life is today, abiogenesis is a hypothesis that tries to explain how life arise.
     
  12. Jul 12, 2004 #11
    The most common error in all of these debates is thinking that evolution is a theory. It is a fact that evolution occured. We can clearly see, in the fossil record, that the first life found was prokaryotic. Gradually we see the emergence of single-celled eukaryotes, then multicellular eukaryotes. Then we see aquatic plants and animals arise, and eventually terrestrial plants and animals. Soon enough, we see the recognizable large mammals, reptiles, and birds that we are all so familiar with.

    The only theory involved is the attempt to explain how evolution occured. Clearly natural selection played a role. Clearly point mutations, mostly due to random replication errors, played a role. Recombination, genetic drift, bottlenecking, and symbiosis (particularly in unicellular life) played a role. Sometimes evolution seems to have occured at a fairly steady, gradual pace. Sometimes it seems to have occured in fits and spurts, marked by long periods of stasis. These are the "theories" of evolution, and they are among the most well-tested and verified of all theories in any of the sciences. The only real questions remaining regard tempo, taxonomic relationships, and the evolution of social and sexual behavior. If you want to question the hypotheses that attempt to answer these questions, be my guest. That is the only real debate.
     
  13. Jul 13, 2004 #12

    Phobos

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    I assume GoneRogue meant to say "modern apes".
     
  14. Jul 13, 2004 #13
    Actually, wasteofo2, it's something of a moot distinction. We didn't evolve from apes, we are apes. If you're asking what suggests that we didn't evolve from other apes, that's fine. But, by every definition of the word "ape", we fit in quite snugly.
     
  15. Jul 13, 2004 #14

    Phobos

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    Just want to re-emphasize the importance of what iansmith and 0TheSwerve0 said. A scientific theory has a different connotation than the layman's use of the term. A scientific theory is an explanatory model that fits the facts. It's a fact that evolution happens (we can directly observe this) and the theory tries to explain how it happens and what the history of it has been.

    It seems to be the history part that you are questioning. Which is fine. Consider the evidences and choose your belief. (If you want to pick linguistic nits, scientists don't "believe" in evolution like a religion or a gut instinct, they "accept" it as an explanation to fit the evidence.) But simply dismissing evolution offhand as "just a theory" is a poor argument because, not only is it incorrect, but it ignores the evidences "a priori".

    I'm not going to touch that one right now. :smile:

    And many Christians accept the theory of evolution. (often a "theistic evolution" where God directs it all)

    For Christians who believe that nothing ever evolved and that the Earth is "young", then they have a lot of explaining to do because that goes against many independent lines of evidence from many branches of science.

    We can all probably agree on that!

    It's one line of evidence. Now overlay that with the physical changes seen in the fossil record (not only anatomically but also in geographic and temporal distribution). And overlay that with genetic similarities over several species and see that the closer the relation (say, in anatomy & time), the closer the genetic similarity. And follow the genetic markers along certain lineages. Etc.

    Which is why scientific ideas are based on evidence (observational, physical, experimental) that is peer reviewed & confirmed by others rather than just opinions or beliefs. The name "theory" is used as a reminder that the work is always in progress. There's always more evidence to gather & details to work out. And yes, theories can be replaced if a better one is found.
     
  16. Jul 13, 2004 #15
    If you'll forgive my adding one more point to an excellent post, Phobos...even if there were something desparately, scientifically wrong with a current evolutionary theory (which there's not; at least, not to my knowledge), that wouldn't mean that we could just discard it. We could try to refine it, or we could try to find (as Phobos called it) "a better one", but a "better one" would have to be one that explained all the innumerable phenomena that current evolutionary theories explain, and do so just as well (or better than) those theories, without falling into the same mistake into which the replacee fell (or into another, different pit-fall), and it should have equal or less premises/assumptions (Occam's Razor). :eek:

    So, I don't think we're getting rid of evolution anytime soon. :rolleyes:
     
  17. Jul 13, 2004 #16

    russ_watters

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    Several problems with this (rehash):

    -"just a theory" is a classic attempt to show weakness in the theory being discussed, but saying it just makes it readily apparent that you don't understand what a theory is.

    -Evolution is more than just a theory. Its data. It is directly observed to occur. Where the theory comes in is figuring out how it hapens and what the implications are of the observed evolution.
    Me too. And to me, thats utterly irrelevant to this discussion. If what you mean is you read the bible literally, then thats a different issue. The biblical creation story if read literally is factually inaccurate.
     
  18. Jul 13, 2004 #17

    jcsd

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    A theory may or may not have data to back it up, a theory may or may not be accepted by scientists. Evolution has mountains of data to back it up and is universally accepted by scientists, so, as well as just being a theory, it is just a theory that we can be certain (as certain as we can be of anything of course) is true.
     
  19. Jul 13, 2004 #18
    Yeah, I meant other apes.
     
  20. Jul 13, 2004 #19
    To add to the "Just a Theory" refutation, I once read a memorable response to that same argument: Yes, evolution is just a theory, but it is also just a theory that the earth orbits the sun.

    If you are gonna dismiss evolution as just a theory to be believed or not on a matter of faith, then science in general must become faith based. But of course science offers us a little more than faith.
     
  21. Jul 13, 2004 #20
    There is no proof that Humans and Apes "evolved" from a common ancestor. We weren't there to see it! I never said it didn't happen. I said it was “just a Theory,” and that people can choose to believe it, which is the same thing as accepting it, or not. That's all I'm saying. I just want the person to know that. Yes, I can see how it works. There are plenty of good examples of how evolution works. But why do we call it evolution? Why couldn't it have been some other process that controlled life on earth? We call this stuff what we can relate it to. That doesn't mean that's how it goes.


    My definition of a theory: is a plausible or scientifically acceptable general principle or body of principles offered to explain phenomena. Now, who says this principle is correct. It may make sense. But it doesn't mean that's what happens. And since when did humans become all knowing, to where everything a group of humans decided was fact became fact. Unless we can go back and actually see that single celled organism, and watch it evolve into millions of different species, until then I say it's just a theory. Just like "the earth revolving around the sun."

    How can you mock me iansmith "Evolution is a theory that explain how life is today” When I said "Evolution is just a THEORY." Um, I think someone is mixed-up here?
    As for as I know you cannot disagree with me when I say that evolution is a theory. Also theories can never be proven true or false. Every science professor in my college career has told me that. Since when did that concept change? That’s all my argument is stating. Now, unless you are saying that evolution is more than just a theory let me know. Otherwise, it's just a Theory that attempts to “explain how life is today,” but that does not necessarily mean that's how it is. Even though that's what we see and think is happening here on Earth. That's not enough to validate a theory that cannot be proven true.

    :biggrin:
     
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