naa diay na nga thread? hehehe.... aw si belle ai, bogets man daw ko...
naa diay na nga thread? hehehe.... aw si belle ai, bogets man daw ko...
you don't have to see Evolution happening in front of your eyes in order to verify that it happened/is happening. there is hard evidence that point towards Evolution and Natural Selection. just because you don't see it happening doesn't mean it's NOT happening. it is happening although in a very slow rate. what ticks me is when people deny the facts because it contradicts their creationist ideals.
speaking of the pace of Evolution, i found this interesting fresh article today:
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Researchers at the University of Pennsylvania have developed a theoretical model that informs the understanding of evolution and determines how quickly an organism will evolve using a catalogue of "evolutionary speed limits." The model provides quantitative predictions for the speed of evolution on various "fitness landscapes," the dynamic and varied conditions under which bacteria, viruses and even humans adapt.
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Speed Limit To The Pace Of Evolution, Biologists Say
Again, one more word that is OUT OF TOPIC and this thread is kaput, and infractions will be duly handed out.
-RODION
"There is this idea that because medicine has been so good at reducing mortality rates, that means that natural selection is no longer operating in humans," said Stephen Stearns of Yale University.
hmmm, why would somebody conclude that "because medicine has been so good at reducing mortality rates, that means that natural selection is no longer operating in humans"? the fact that we need medicine shows that we are not perfect organisms. being imperfect means then that humans are still subject to change, or evolution in other words. i was just wondering who coined the idea that Mr. Stearns quoted in the first place.
Before I answer this question, I invite anyone reading to watch this video first:
YouTube - Cosmos: "Heike Crabs" to aid in grasping/understanding my point.
In the case of the Heike crabs, humans have "interrupted" natural selection to form the face of the warrior on the carapace of the crab. This is parallel to what we humans are currently doing to ourselves, via medicines/drugs. There is now artificial selection going on. But that doesn't mean that natural selection is still ongoing. In areas where there are no sophisticated medicines or drugs, natural selection among humans is still going on.
So again, it's very simple:
Natural Selection = no human intervention
Artificial Selection = human intervention involved (i.e. breeding of domesticated animals, the Heike crabs, and humans being treated with sophisticated/advanced medicine)
And this is the important part--BOTH natural and artificial selection are still subsets of the process of evolution. It's not an issue of one or the other.
Ergo, cats and dogs you find in your house, wouldn't have existed today, if humans didn't interfere in their breeding process. They have evolved through time, to be what they are now--smaller and mild-tempered versions of their wild cousins (i.e. Ocelots/Lynx and coyotes/hyenas)
-RODION
Last edited by rodsky; 11-04-2009 at 01:12 PM.
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