Deamiter
I just follow Christ.
Amazingly this buildup of small adaptations is exactly what we see in nature, and equally you're absolutely right that it will never become oil.It isn’t until you introduce something new and foreign that you are going to get something different. Where does that foreign substance come from? It has to be new and different enough to effect change but not too foreign or different as to effect character and consistency. Blue paint matches that description because it shares most of the characteristics and consistency of yellow paint and can therefore be easily absorbed into it. Sure you can change the color of the paint by introducing a small variation over a long period of time but remember in the end you’ve still got paint. It hasn’t somehow become water or oil for example. That’s what I see as adaptation not evolution.
I'll address the second point first -- a mammal will never become a non-mammal. The first mammal was a species that had just changed enough to be called "green" instead of yellow. Since that first mammal, many MANY different populations have accumulated enough differences to become considered different species, but every single organism that descended from the first mammal is STILL a mammal and always will be a mammal. That's why we have different types of classifications -- i.e. kingdoms, species etc... This is basic to evolution, and something creationists frequently misrepresent or don't understand, so if that doesn't make sense to you, please stop here.
Now mutations are almost by definition "new and different." They change an organism's DNA, and an accumulation of changes can lead to a whole lot of large differences! Further, as before, it's still paint -- you're not introducing new amino acids or anything, the changes are solely within the existing framework of DNA.
In nature, we do actually see large changes that are the product of small variations (or to speak from your point of view, could conceivably be the product of many small variations). I love the example of the nerve that controlls our swallowing and voicbox -- in all mammals it travels from our brain, down around an artery near the heart and then back to the throat. In fish, this is the fastest route, but in humans it's clearly not the most efficient (in giraffes, it really does travel all the way down and back up their necks!) This makes very little sense in terms of special creation, but it's exactly what you'd expect to find if we evolved from fish (or ancestors of fish). The nerve can't make one of the large changes you talk about, so it can't just disconnect itself and move to the other side of the artery. Small changes in brain placement and neck size have accumulated to leave us an important clue.
Similarly with hearts -- fish hearts have only one chamber that pumps blood throughout the body. There are amphibians that have semi-sectioned hearts that generally direct flow, to and from the lung with a seperate section, and mammals have two totally distinct paths going to and from the lungs.
There are literally hundreds of little stories like this where a long series of what you would rightly call adaptation build up to account for end products that look very different. I mean, if we'd never seen amphibian hearts, it might be very convincing to say, "how could a single-chambered heart adapt slowly to a 4-chambered heart?!?" A careful study of the many structures that are present today, however, tells the story of how it's not only possible, but that it actually happened.
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