General bob-omb
BOOM
I wouldn't say the change would be a combination, just micro-evolution. It is likely that the two new "species" are still the same species, just a different variety (much like humans and dogs). The main issue is the definition of a species. This has always been a matter of debate. There are at least least two major species definitions (Biological and Morphological) as well as a few minor ones. However, the biological definition (A species is capable of breeding and producing viable offspring) contradicts many animals defined as "species" that can breed in their population's overlapping zone. The Morphological definition (similar appearance) contradicts that even more, considering the similar structure. So really, most things we consider different "species" are actually the same species but in a different variety.
To refer to your previous post, the problem with the fish, turtles, and other amphibians evolving around the islands is that, according to the evolutionary theory, all three of these underwent that kind of evolution long (100's of millions of years) before the Galapagos islands were formed (8 million to 90 million years ago). Your bird hypothesis would work, however, the chance of seeds is low considering they would have "to be blown by the wind, in the correct direction, hundreds of miles, and land on the islands (not the water)". The seeds would also have to land on fertile ground (at least enough to grow). However your bird hypothesis would rely on the seed hypothesis, because without the plants and seeds the birds would starve or eat themselves until extinction, there is also the matter of the birds migrating in the correct direction.
In reply to the second paragraph of your earlier post, even if the tree had a gene granting it long, life that long life could, in no way, reach several million years. After death, decay follows. A tree can not be fossilized for a long period of time without dying, the lack of resources would kill it off, starting the decaying process and destroying the tree before being fossilized successfully. By-the-way this tree is called a prostrate (many strata) tree and there are many like this, this increases the unlikeliness of one-time occurrences (in relation to your two hypotheses) happening in many locations. For your next hypothesis, an asexual system of trees are separate organisms that reproduce asexually, they don't feed each other in the way on organism would its parts. If 9 out of 10 trees are killed in an asexual tree population that 1 still survives because it doesn't rely on others for its food. Likewise, a dying tree is not feed by its neighbors to keep it alive.
To refer to your previous post, the problem with the fish, turtles, and other amphibians evolving around the islands is that, according to the evolutionary theory, all three of these underwent that kind of evolution long (100's of millions of years) before the Galapagos islands were formed (8 million to 90 million years ago). Your bird hypothesis would work, however, the chance of seeds is low considering they would have "to be blown by the wind, in the correct direction, hundreds of miles, and land on the islands (not the water)". The seeds would also have to land on fertile ground (at least enough to grow). However your bird hypothesis would rely on the seed hypothesis, because without the plants and seeds the birds would starve or eat themselves until extinction, there is also the matter of the birds migrating in the correct direction.
In reply to the second paragraph of your earlier post, even if the tree had a gene granting it long, life that long life could, in no way, reach several million years. After death, decay follows. A tree can not be fossilized for a long period of time without dying, the lack of resources would kill it off, starting the decaying process and destroying the tree before being fossilized successfully. By-the-way this tree is called a prostrate (many strata) tree and there are many like this, this increases the unlikeliness of one-time occurrences (in relation to your two hypotheses) happening in many locations. For your next hypothesis, an asexual system of trees are separate organisms that reproduce asexually, they don't feed each other in the way on organism would its parts. If 9 out of 10 trees are killed in an asexual tree population that 1 still survives because it doesn't rely on others for its food. Likewise, a dying tree is not feed by its neighbors to keep it alive.