I would explain it by creation of course. But if you want to hear my explanation, then I’m going to have to make some observations.
So, God created fish. Waited hundreds of millions of years. Then created fishapods. Waited hundreds of millions of years. Then created amphibians. Waited hundreds of millions of years. Then created reptiles. Waited hundreds of millions of years. Then created mammal-like reptiles. Waited hundreds of millions of years. Then created mammals, etc.?
Animals don’t mate indiscriminately. They discriminate. Individuals who don’t look right are kicked out. So when we look at populations, we see homogeneity. One sparrow looks like another sparrow to us. Maybe not to another sparrow - they know who belongs - but that’s not important. They look alike to us. We see homogeneity. We also see it in populations of humans - Japanese, Chinese, etc.
So, how do you explain the simple fact that when two populations of humans come together, they
always interbreed? Why are some european men attracted to oriental women? Why are some oriental men attracted to scandanavian blondes? etc., etc.?
Mutations act on populations. A long neck may be beneficial. If it is, then this trait will work its way through the population until every member of the population has a long neck. Some populations will have short necks. Mutations act on pre existing fully functioning structures. There are structures analogous to birds and man, but you don’t see winged men. Mutations can not account for wings, or for any foreign structures for that matter.
Mutations act on individuals. Natural selection acts on populations. I already explained how dinosaurs evolved wings. Wings are, afterall, just adapted forearms. So, yes, evolution does work on what is already there. That is why there are no men with wings sticking out of their backs.
However, mutations occur.
Yes, that is where variation comes from.
Take Darwin’s finches.
My explanation - Two populations of finches arrive from the mainland in search of food. The members of population A have a large beak. The members of population B have a small beak. Population A finds island 1 has a good supply of food. The nuts are hard to crack, but it has a large beak so it works out well for the members of population A. Population B also finds island 1, but its’ beak isn’t large enough to crack the nuts. So it moves on to island 2. The food there is acceptable. Some members from population A also arrive at island 2, but they are beaten back by the more numerous population B. The members of population B defend their territory. Birds are territorial.
I see some obvious problems with your explanation:
1. There are multiple species of finches, not just two.
2. None of the species found on these islands are found on the mainland.
That’s my explanation of what Darwin found. The difference in the size of the beak determined where the birds ended up. But I guess that’s not the way Darwin tells it. According to evolution, the bird’s beak evolved by natural selection while they were on the island. I don’t think that’s true. My explanation is simpler and it doesn’t involve natural selection.
Your explanation is unfortunately wrong. There are many examples where remote island chains feature closely related species that are not found
anywhere else including the nearest mainland. The Honeycreepers of Hawaaii are another example.
http://en.wikipedia.org/wiki/Hawaiian_honeycreeper
As to your question, from a creationist point of view, there is no problem. The Bible states fish and things that live in water were created first.
But there are many things that "live in the water" that only came later. Marine reptiles like mosasaurs and cetaceans like Blue Whales are some examples. Even fish are relatively late comers to ocean environments according to the fossil record. How many fossils of fish are there in the Burgess Shale of British Columbia?
Burgess Shale - Wikipedia, the free encyclopedia
But my point is still we don’t find living transitional species. Take the human line, for example. We don’t find living members of Neanderthals, Homo erectus, Homo habilis, Australopithecus afarensis, etc. The same is true of every creature that is presently living. We don’t find their ancestor species alive and well. I would expect to see the branch - some species that did not go extinct.
You keep saying this, but ignore the explanations you have been given for this.