According to evolutionists" claims, the ancestors of fish were invertebrates, which lack backbones. However, evolutionists fail to answer how these ancestors with spines but no bones developed a backbone. That is because, these living beings should undergo such great changes that the hard shell surrounding their bodies should disappear while a skeleton appears inside. For such a transformation, there should be many intermediate links between the two organisms. However, evolutionists fail to show even a single fossil as an intermediate form between vertebrates and invertebrates. On the other hand, millions of fossils show that fish always remained as fish, this 54- to 37-million-year-old perch fossil is one of them.