Practice question

Origin of amphibians traced to Late Devonian early tetrapodomorph diversification leading to labyrinthodont stem tetrapods and crown lissamphibians diverging in early Carboniferous after evolution of digits and terrestrial adaptations. Fossils Ichthyostega, Acanthostega intermediate showing limbs yet retaining fish-like tail fin and gills indicating aquatic ancestry. True amphibians temnospondyls and lepospondyls radiate Mississippian swamp forests. Cambrian and Ordovician predate jawed fishes and tetrapodomorphs, Triassic postdates amphibian dominance preceding reptile expansion, Devonian remains earliest amphibian emergence matching lobe-finned fish record. This concept holds high importance for NEET, CBSE board, CUET and competitive examinations focusing on comparative morphology