Chordata

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"):}

Which of the following statements are correct regarding class-Reptilia of phylum-Chordata? I. Males possess copulatory organs (heipenis). They are double in snakes and lizards, and single in crocodiles and turtles. II. Fertilisatin is internal, methamorphosis is absent. III. Granial nerves 10 pairs. IV. Kidney mesonephric, urea is chief nitrogenous waste. Choose the correct option.

Assertion: Hemichordata was earlier considered as subphylum under phylum chordata. But now it is placed as a separate phylum under non-chordata. Reason: Hemichordates have open type of circulatory system and indirect development.

Which one is correctly matched ? {:(,"Animal" , "Characteristic" , "Taxon") , ((A) , "Millipede" , "Ventral nerve cord" , "Arachnida"),((B), "Silver fish" , "Pectoral and pelvic fins" , "Chordata"),((C), "Duck - billed Platypus" , "Oviparous" , "Mammalia"), ((D) , "Sea Anemous" , "Triploblastic" , "Cnidaria"):}