Closed circulatory system is present in

Which trait is common among Earthworm, Leech, and Centipede?

Which of the following statements are true/false?
$(i)$ In $Torpedo$,the electric organs are capable of generating strong electric shock to paralyze the prey.
$(ii)$ Bony fishes use pectoral,pelvic,dorsal,anal,and caudal fins in swimming.
$(iii)$ Amphibian skin is moist and has thick scales.
$(iv)$ Birds are poikilothermic animals.
$(v)$ The most unique mammalian characteristic is the presence of milk-producing mammary glands by which the young ones are nourished.

Match List $I$ with List $II$ :

List $I$	List $II$
$A$. Pleurobrachia	$I$. Mollusca
$B$. Radula	$II$. Ctenophora
$C$. Stomochord	$III$. Osteichthyes
$D$. Air bladder	$IV$. Hemichordata

Choose the correct answer from the options given below :

The only incorrectly matched pair is:

Phylum	Level of organisation

An animal that is initially male and then changes to female is called: