What is common between an earthworm,a cockroach,and a centipede?

Which group of animals consists of poikilothermic (cold-blooded) animals?

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: $Coelenterata$

Identify the mismatch among the following pairs:

Haemocoel is found in

How many of the following animals are homeothermic (warm-blooded)?
Rattus,Macropus,Balaenoptera,Columba,Calotes,Crocodilus,Naja,Hyla,Rana,Neophron,Tigris