[ad_1] Fish evolved 530 million years ago, with the oldest known being Pikaia gracilens. Jawed fish evolved 420 million years ago, with placoderms dominating until the Devonian period. Many modern and extinct forms evolved during this period, including sharks, rays, and lobe-finned fish, which eventually evolved into terrestrial vertebrates. Acanthodians became extinct, while lobe-finned fish […]