evidence: birds-dinosaurs, unconvinced
-theropod late, oldest bird 150 m-theropods 115 m ago
-But: nonavian maniraptor - oldest birds
-failures fossils doesn't mean no existence in undiscovered deposit
-Also: fused clavicles differ from unfused theropods
-reasonable when only early theropod clavicles But fossilized theropod clavicles look like wishbone
-complex lung can't evolved from theropod
-no supply no falsified because no lungs are preserved
• birds: evolved from dinosaur(theropod)
○ scientist: unconvinced
§ Theropod: too late
□ Al(BIRD): 150 M years ago
□ Fossil of theropod: only 115M years
□ BUT:bones uncovered
® Fail to find fossil: not rule out the existence
§ Fused clavicles:differ
□ But fossilized theropod
§ Finally: lungs
□ Not supported or falsified
® Bcz: no fossil lungs