Hi alaninont, welcome to the fray
Let me ask you about what you mean by
No one has ever said "complete chance".
If it's not complete chance, then the inference is that there was some guidance. What other options are there?
Selection. Because not all organisms can survive and breed at will, some will and some won't. Just as artificial selection - your guidance provided by humans within breeding programs - does not create new features, it just selects those that are preferred by the breeder/s, so does selection occur naturally because there are differences between organisms. These differences result in different ability to survive and breed.
Differential survival and reproduction of organisms within a population, when not all members can survive and breed, results in selection of traits that favor survival and breeding: some organisms will be better able to survive, some will be better able to breed, some will be better at both.
Obviously any organism that dies before it reproduces will not pass on their hereditary traits to the next generation.
Obviously an organims that has many offspring will pass on their hereditary traits in a higher proportion than those that only have a few offspring.
Enjoy.
Edited by RAZD, : t
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