The Barbarian
Crabby Old White Guy
- Apr 3, 2003
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Just because they're not the same doesn't mean they changed over time, part of the tree of life and are common ancestors as Darwin believed.
Back in his day, Darwin said these living fossils were few and didn't change because there were in remote locations and wasn't any reason to, i.e. there wasn't environmental pressures and competition.
That's how it is today. The "living fossils" are organisms that have existed in relatively constant environments. However, even these have changed over time. Modern coelacanths, for example, are quite different from ancient coelacanths.
However, there are so many of these living fossils found in wide areas of the world and they're found in same layers as dinosaurs and even earlier. How evos have explained is that these evolved slowly over time.
They have, but in some extreme cases, they've changed very little.
Yet, today we know that creatures can be hybrids and evolved rapidly over a few months.
Under the right conditions, evolution can proceed fairly rapidly. For example, a species of lizard evolved a new digestive organ in just a few decades after moving into a different environment.
We have genetic engineering and epigenetic inheritance where they evolve even more rapidly.
Epigenetic changes don't seem to persist over more than a few generations, so it's not really much of a factor in speciation, if it matters at all. And human intervention has always been known to produce faster change than natural selection. Darwin wrote about it in his book.
This doesn't follow Darwin's evolution of changes over time and tree of life.
Which of the four basic points of his theory do you think don't apply to such things? I can't think of any.
Instead of a tree, it seems there are bushes of life.
Darwin's diagrams look more like bushes than trees, so that fits pretty well. The notion of it as a tree comes from Linnaeus, who first noted that life can be fitted into a diagram that looks like a family tree. DNA analysis has conformed Linnaeus' observation. But he didn't even consider evolution. Darwin explained why that tree exists, and genetics confirms his discovery.
It doesn't follow slow natural selection or slow mutation.
Not all evolutionary change is by natural selection. As Darwin pointed out, random variation will occur in the absence of strong selective forces.
It doesn't necessarily mean that we have to scrap Darwin's evolution, but it appears that he was wrong.
The four basic points of his theory have been confirmed. However, he was wrong in a number of things, such as the nature of inheritance. Modern evolutionary theory includes genetics in addition to Darwin's discoveries.
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