Among the following,which are colonial insects?

In which of the following is the blood pressure low and irregular?

Exoskeleton of arthropods is composed of:

Bombyx mori belongs to the class

What is true about $Scorpion$,$cockroach$ and $silver$ $fish$?

$S$ - Statement: Malpighian tubules are the excretory organs in $Arthropoda$.
$R$ - Reason: $Arthropoda$ belongs to the phylum $Mollusca$.