Wolves don't make bananas or corn or fish.
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A dog doesn't change over time to be a horse
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When a farmer plants corn he knows he is going to get corn. He doesn't sit and wonder what evolution is going to grow for him. Watermelons? Catfish? Spiders?
You keeps saying things like that. Just to be clear, NOBODY is saying it works that way.
Try this, and tell me where you disagree. I want to find the part where the disconnect is.
Let's say I have a whole bunch of cats. Like, a lot of them. If you've met a lot of cats, you probably know that housecats often have a mutation that causes them to have extra toes.
1. Would you agree that, over time, if the cats with extra toes mate with other many-toed cats, this will become more common?
2. Would you further agree that this could happen (again, over time) with multiple mutations or variants?
3. Would you agree that this can happen to multiple groups, such that cats in one area look significantly different from cats in another area?
4. Would you agree that, through this process, two sets of cats might be different enough that interbreeding is very difficult (and impossible in the wild) due to things like size (picture a chihuahua and a great dane trying to mate)?
So far this is observable (we have lots of breeds of cats) so I would think we're on the same page. If you disagree already we have some major confusion going on. Now onto the next step:
5. Would you agree that eventually through this same process it might get to the point where the myriad variations and mutations make interbreeding of the groups impossible, or result in sterile offspring?
I would argue that #5 is also observable (a real world example of this would be a mule).
6. Once the two groups are not able to interbreed would you agree that you can say they are different species?
Note that at each step it's not a cat giving birth to a watermellon - it's a cat giving birth to a cat. It's just that, over time, they change and the two groups eventually can't really be called the same thing. It's slow, and subtle, but the end result is both new groups are descended from cats even if neither can be called cats themselves.