Fossil evidence actually shows that amphibians evolved from fish first. It went like this according to the evidence we have: fish > amphibians > reptiles > mammals > aves. How do we know this? Fish fossils predate amphibian fossils which predate reptile fossils which predate mammal fossils which ultimately predate ave fossils.but i sometimes just hope that if possible then somedsy science proof that human beings are the ancestors of human beings only,not apes.