AP EAMCET Medical 2017 Shift 2 Paper

Study the following structures
(A) Sternum
(B) Tympanum
(C) Cleidoic egg
(D) Thiree semicircular canals
(E) Hardarian glands
(F) Amnion
(G) Columella auris
Which of the above appeared for the first time in successful land vertebrates