What is common among bed bugs,leeches,and mosquitoes?

Select the correct option in respect of characteristics of each group:-

Characteristic	Cyclostomata	Chondrichthyes	Osteichthyes
$(i)$ Habitat	Marine	Marine	Marine, Fresh Water
$(ii)$ Mouth	Sucking mouth	Ventral mouth	Terminal mouth
$(iii)$ Gill Slits	$6-15$ Pairs	$5-7$ Pairs	$4$ Pairs
$(iv)$ Scales	Absent	Placoid	Cycloid/Ctenoid
$(v)$ Fins	Unpaired	Paired	Paired

Which of the following characteristics is $NOT$ shared by birds and mammals?

Which one of the following species correctly matches its two characteristics and phylum/class?

Species	Two Characteristics	Phylum/Class
$A$. Ascaris	$i$. Body segmented,$ii$. Males and females distinct	Annelida
$B$. Salamandra	$i$. Tympanum represents ear,$ii$. External fertilization	Amphibia
$C$. Pteropus	$i$. Skin possesses hair,$ii$. Oviparous	Mammalia
$D$. Obelia	$i$. Cnidoblasts,$ii$. Organ-level organization	Coelenterata

Metamerism is a characteristic feature of which of the following?

Match the animals listed under Column-$I$ with their respective zoological names given under Column-$II$; choose the answer that provides the correct combination of the alphabets of the two columns.
Column-$I$ (Common Name) | Column-$II$ (Zoological Name)
$A$. Starfish | $p$. Sepia
$B$. Jellyfish | $q$. Astropecten
$C$. Devilfish | $r$. Aurelia
$D$. Cuttlefish | $s$. Octopus