786 said:
LOL. Go read the other post again. And BTW you are changing the topic.
Can you prove that an eye was formed gradually?
When you share animals, you cannot link them to evolutionary chain, since you do not know if an eye can or cannot be formed gradually.
It could be that some have less effective eyes than others, but you still can't make a claim of evolution if you don't know if an eye can be formed gradually.
I did answer your question. It is your responsibility to educate yourself. I am not going to write a paper for you explaining the minutia of how each of those organisms can be linked. The eye was formed over countless generations.
A human male, when mated with a human female, can produce almost 70,000,000,000,000 children without getting two that are the same. That does not include any crossing-over. From those children you can imagine that some will run faster than most. In an environment where you are trying to escape predation it makes sense that the fastest will live long enough to have children. The average guys...well...not so much. But, those that are at the slowest end may never be chased. They blend better because they move more gradually and don't attract attention.
When they have children it is natural that the slow will mate with the slow and the fast with the fast. When they do mix, the medium speed children will be eaten as before. In only one generation you can show isolation.
If it is good to be fast, then it is better to be fast and nimble. So after the medium guys are gone than those that are only fast will be next. Until most of the fast guys are both fast and nimble.
If it is good to be slow, then it is better to be slow and small. So the trend continues here too. Soon the people that are left in this group are slow and small. Before, long the isolation is complete. They don't just interbreed reluctantly, they are not capable. They become mechanically isolated.
If all parents on earth had even close to the potential number of children evolution would happen in a few years like it does with bacteria and other fast breeding organisms. But, at 2 1/2 children each, it takes thousands or millions. This is natural selection. It is not Dependant on mutation only. Just recombination demonstrates it is factual.
96% of children that die before birth, die as a result of an unfit genetic code. So enough recombination, crossing-over and mutation occurs to show us it happens. Sometimes the change is good. I think someone gave the cycle-cell example.
The same is true of eyes. From generation to generation light sensitivity became beneficial for some organisms. So phenotypes that could see were selected for. Some could see better than others. So once all could detect light, only those who could detect both light and shapes survived. Then light, shapes and depth. Mutation plays the smallest role. Random assortment, which is not theory but undeniable fact, plays the biggest role.
