Did frogs exist with dinosaurs? Now, lumps of amber dating back to the Cretaceous period have revealed a set of four tiny tropical frogs thatlived alongside the dinosaurs, making them the oldest frog fossils of their kind. How did amphibians evolve from reptiles?
Could humans have evolved from amphibians? Do amphibians go through complete metamorphosis? Do reptiles and amphibians have backbones? When did fish evolve into amphibians? Are fish mammals or amphibians? Are reptiles and amphibians ectothermic?
The group gnathostomes, meaning "jaw-mouths," includes tens of thousands of living vertebrate species, ranging from fish and sharks to birds, reptiles, mammals and humans. Are frogs Amniotes? Salamanders, frogs, and other living "amphibians" are in a quite derived lineage of tetrapods, called...
Did amphibians evolve into reptiles? Did amphibians evolve from reptiles? Did amphibians evolve before reptiles? Do amphibians lay telolecithal eggs? Do all amphibians come from an egg? Do amphibians lay their eggs in water? How do amphibians and reptiles reproduce? Are worms insects or amphibians?