A. Sphenodon
B. Amniota
C. Amphioxis
D. Coelocianth

A. Prototherian mammals
B. Eutherian mammals
C. Metatherian mammals
D. None of these

A. Prototheria
B. Metatheria
C. Eutheria
D. None of these

A. Metatherian mammals
B. Prototherian mammals
C. Eutherian mammals
D. None of these

A. Prototherian mammals
B. Metatherian mammals
C. Eutherian mammals
D. Reptilia

A. Prototheria
B. Metathena
C. Eutheria
D. Reptilia

A. Amphibians and fishes
B. Amphibians and reptiles
C. Amphibians and birds
D. Reptiles and birds

A. Amphibia
B. Osteichthyes
C. Agnatha
D. Reptilia

A. Reptilia
B. Amphibia
C. Chondrichthyes
D. Osteichthyes

A. Amphibians
B. Reptiles
C. Fishes
D. Molluses