I will admit right now I didn't read anything after the OP. I know exactly what kind of blather it is and I've read on a thousand other forums. So, hopefully without being too hypocritical, I would like to insert my $0.02:
Evolution will always tend to fill niches, because to not do so would require a circumstance of incredible improbability. All of the trillions of mutations that go on every day all over the planet would have to not be suitable to exploit an environmental niche, and this seems ridiculous. Also, the history of life on Earth has shown that after every great extinction, all niches were prompty filled. If filling niches was uncommon, then this would not likely be the case, given that there have been half a dozen great extinctions. In fact, not only were all niches filled every time, but they got filled quicker every time. For example, the Cambrian Explosion took a few tens of millions of years, whereas the rise of mammals after the K/T event took only a couple of million years. So I contend that all niches will always be filled as a matter of course.
So now, to look at the neuron, it seems clear that its development was absolutely inevitable. The niche of animals is quite large, and to think that there would be some special reason that it wouldn't normally be filled is ludicrous.
Now, I would also like to touch upon the Fermi Paradox. Now, I'm sure someone must have mentioned the Drake Equation somewhere in this thread. If you put reasonable numbers into it, you will find that at any given time, the galaxy (or conversely the sky) will have at most a few dozen communicating civilizations in it. A few dozen, sharing an entire galaxy. And then I look at SETI, and I see that:
1) SETI has been searching one frequency for the vast majority of the time it's been going
2) SETI has been focused on nearby stars
3) SETI doesn't have the capability to detect stray radio signals from civs more than a few hundred lightyears away
4) SETI assumes civs will prefer radio over one of the dozens of other communication methods
5) SETI assumes other civs will be as wasteful as we were in the 20th century and send their signals out into space
Given all this, it should not come as a surprise that SETI hasn't found anything. So that resolves the paradox.
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