According to evolution, fish developed arms and legs and became amphibians eventually right, but how exactly did it start? I can see how a fish that can also walk can be considered more fit, therefore natural selection would select that fish to further evolve, but right at the beginning, when there was a mutation that game fish tiny leg/arm bones, how did that help the fish at all, and how did natural selection select that fish as apposed to the other ones with no leg/arm bones. Because at the beginning, when the little arms and legs were useless still, I see no reason why that fish with the little arms/legs should not die, along with its mutated self. I'm far from an expert, so please point out any misconceptions of mine, while answering, thank you.
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