Which of the following is common between Annelida and Arthropoda?

Which of the following is common among a leech,a mosquito,a bed bug,and a rat?

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 the following columns.

$a$. Cellular level of organisation	$1$. Cnidarians
$b$. Organ level of organisation	$2$. Platyhelminthes
$c$. Organ system level of organisation	$3$. Chordates
$d$. Tissue level of organisation	$4$. Porifera

Select the correct sequence for $a, b, c, d$.

What is correct for fishes,amphibians,reptiles,Aves,and mammals?

Phylum $Annelida$ resembles $Mollusca$ in embryonic features because both have