Which of the following characteristic features always holds true for the corresponding group of animals `{:("(a)","Cartilagious endoskeleton",,"Chondrichthyes"),("(b)","Vivparous",,"Mammalia"),("(c)","Possess a mouth with an upper and a lower jaw",,"Chordata"),("(d)","3- chambered heart with one incompletely divided ventricle",,"Reptilia"):}`A. `{:(,"Viviparous",,"Mammalia"):}`B. `{:(,"Possess a mouth with an ",,"Chordata"),(,"upper and a lower jaw",,):}`C. `{:("3-chambered heart with one incompletely divided ventricle ",,"Reptilia "):}`D. `{:("Cartilaginous",,"- Chondrichthyes "),("endoskeleton",,):}`

Which of the following characteristic features always holds true for t

1.	Which of the following characteristic features always holds true for the corresponding group of animals `{:("(a)","Cartilagious endoskeleton",,"Chondrichthyes"),("(b)","Vivparous",,"Mammalia"),("(c)","Possess a mouth with an upper and a lower jaw",,"Chordata"),("(d)","3- chambered heart with one incompletely divided ventricle",,"Reptilia"):}`A. `{:(,"Viviparous",,"Mammalia"):}`B. `{:(,"Possess a mouth with an ",,"Chordata"),(,"upper and a lower jaw",,):}`C. `{:("3-chambered heart with one incompletely divided ventricle ",,"Reptilia "):}`D. `{:("Cartilaginous",,"- Chondrichthyes "),("endoskeleton",,):}`
Answer» Correct Answer - D Reptiles have 3-chambered heart except crocodiles. Mammals are viviparous except prototherian mammals, chordates have jaws except protochordates and cyclostomes.