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Originally posted by raeanna74
Well if you believe that
1. Evolution is NOT a theory.
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I have already explained my views on this.
To claim "Evolution is only a theory" does
not constitute an argument. See my reasoning above.
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2. Seciation has been observed.
Then this debate has no purpose whatsoever.
When you refer to dogs that were a different species. Were you saying that they were so simply because they could not reproduce? If that is what you meant that we also created a new species by breeding horses with donkeys and creating Mules. The only problem with this is that BOTH of those new species were completely unable to replicate themselves on their own and thus would be a dead us branch of evolution.
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The definition of "species" is not a very strong one. Much of Darwin's Origin of Species is spent explaining how nature simply dpesn't fall into the categories that we design for them. Nature doesn't
care about the words we use to describe it, it just
is.
As a result "speices" and "speciation", are difficult to pin down.
The most common "working model" defnition of a species is:
Two creatures who cannot produce viable offspring with each other, belong to different species.
(viable meaning...that creature itself being capable of reproduction)
So to your question "Were you saying that they were so simply because they could not reproduce?", I answer YES, because that is the definiton of a species.
For a more in depth look at the meanings of such words, take a look at that first link I provided.
So, in other words....
a) different breeds of dogs, who cannot produce viable offspring, are actually members of a "different species". They will eaither be unable to reproduce, or anything that they do give birth to will be too deformed to be able to reproduce.
b) Donkeys are a different spcies of animal from mules, because they cannot create viable offspring.
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Can you find ANY form of speciation that actually produces positive results?
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Yes! I provided two links, each of which give dozens of examples of observed speciation.
I chose the example of dogs because it is a well known one. However it happens to be a bit of a messy one. (X can mate with Y which can mate with Z, but X can't mate with Z). But if you don't like it, there's plenty more.