Bone versus cartilage-a study in evolution.
D000818:Animals; D005075:Biological Evolution; D001846:Bone Development; D001842:Bone and Bones / Q000196:embryology; D002356:Cartilage / Q000196:embryology / Q000254:growth & development*; D003094:Collagen; D003804:Dentin / Q000254:growth & development; D010163:Paleontology; D012863:Skeleton / Q000254:growth & development; D014714:Vertebrates
D003094:Collagen