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Fish->Tetrapod (Fish-tetrapod Anatomy changes (Head = wider, flattened…
Fish->Tetrapod (Fish-tetrapod Anatomy changes, Why venture onto land?, Earliest Tetrapod Tracks ~390 Myr, Earliest Tetrapod Skeleton ~370 Myr, Anatomical Changes on Line to Tetrapods, Two Critical Early Greenland Tetrapods, World of Early Tetrapods)