Yes, there are many example in evolution of going from complex to simpler. Evolution does not imply going from simple to complex. Evolution is change in gene frequencies over time and that's it.
There is no opposite to evolution, evolution is a one-way street to change to have a better chance to reproduce, that's all it is even with all it's complexity. The complexity or simplicity of the gene pool is irrelevant if the organism is more successful at reproducing.
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Right. I read it, and responded to it.PauloL wrote: ↑Fri Aug 18, 2017 11:25 pmSorry. The thread goes long.
Get it here:
viewtopic.php?f=12&t=14226&start=120#p325250
Organisms reproduce with variation. There must be variation for evolution to work.
No. You start with simple replicators -- cell precursors -- that reproduce variably. Then natural selection and drift work on that variability.Where's Achilles tendon here? Right on the first premise. You start with a variable population to explain that a population evolves because of variation. Could it be more circular than this?
The only thing that could be considered a guiding force is the environment. The environment is the force that selects for evolution to occur, if there is no change in the environment there is no change in the organism. For a prey animal the environment includes the predators and for a predator the environment includes it's prey. There have been numerous cases where changes in the prey have produced changes in the predator.
Your spaced out posts resemble Bills, are you Bill's sock? You seem to be just as ill-informed as he is.PauloL wrote: ↑Sat Aug 19, 2017 3:29 am .
David,
What do you mean as cell precursors?
So you need variation for evolution, so where did evolution start? I think a primordial cell is no longer enough.
3.5 billion years isn't that long, given the hugely small probabilities for the genomes now on earth to appear randomly.
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Very simple replicators that were the ancestors of cells. There are many ideas on what these could be, but no one is certain and may never be certain because life started about 3.5-3.8 billion years ago and it VERY HARD to get good information about stuff that happened so long ago,
It started with the first simple replicators because they reproduced with variation. Reproduction with variation entails evolution.So you need variation for evolution, so where did evolution start?
Why would you say this? In the first place, these genomes did not evolve randomly. Random mutation PLUS natural selection is not a random process. Plus, it is known that eyes, which are very complex, evolved within a few million years, which is a tiny, tiny, tiny, tiny fraction of 3.8 billion years; moreover simpler eyes evolved much more quickly and the eye has evolved independently many times.3.5 billion years isn't that long, given the hugely small probabilities for the genomes now on earth to appear randomly.
