In the given examples,how many animals are viviparous? Corvus,Columba,Macropus,Pteropus,Calotes,Hemidactylus,Psittacula,Struthio and Macaca.

Match List $I$ with List $II$ :

List $I$	List $II$
$A$. Pterophyllum	$I$. Hag fish
$B$. Myxine	$II$. Saw fish
$C$. Pristis	$III$. Angel fish
$D$. Exocoetus	$IV$. Flying fish

Choose the correct answer from the options given below :

$12$ pairs of cranial nerves are present in

What is the scientific study of fishes called?

Assertion: All birds,except the ones like koel (cuckoo),build nests for retiring and taking rest during night time (day time for nocturnal).
Reason: Koel lays its eggs in the nests of tailor bird.

In which one of the following is the genus name,its two characters,and its class/phylum correctly matched?

Genus Name	Two Characters $\&$ Class/Phylum
$A$. $Ascaris$	$(i)$ Body segmented,$(ii)$ Males and females distinct; Phylum: $Annelida$
$B$. $Salamandra$	$(i)$ $A$ tympanum represents ear,$(ii)$ Fertilization is external; Class: $Amphibia$
$C$. $Pteropus$	$(i)$ Skin possesses hair,$(ii)$ Oviparous; Class: $Mammalia$
$D$. $Aurelia$	$(i)$ Cnidoblasts present,$(ii)$ Organ level of organization; Phylum: $Coelenterata$