Sets of these objects are classified as basic, alternative, or definitive by the Humphrey-Parkes system.These structures are found along the alar tract. Some of these objects contain thin segments calledbarbules organized around a rachis. Diogenes Laertius claimed that Socrates defined man as a bipedwithout any of these objects. Three white ones appear in the heraldic symbol of the (*) prince of Wales.These objects, a prized trade good in the Aztec empire, can be cut or fitted with metal to create a nib. Recent fossildiscoveries suggest that theropod dinosaurs had thes
Sets of these objects are classified as basic, alternative, or definitive by the Humphrey-Parkes system.These structures are found along the alar tract. Some of these objects contain thin segments calledbarbules organized around a rachis. Diogenes Laertius claimed that Socrates defined man as a bipedwithout any of these objects. Three white ones appear in the heraldic symbol of the (*) prince of Wales.These objects, a prized trade good in the Aztec empire, can be cut or fitted with metal to create a nib. Recent fossildiscoveries suggest that theropod dinosaurs had these features even earlier than the first discovered fossil of one onArchaeopteryx. For 10 points, name these biological structures which can be made into quill pens.