Which one feature is common to leech,cockroach and scorpion?

In which of the following kingdoms do organisms primarily reproduce through sexual methods?

Consider the following statements:
$A$. Annelids are true coelomates
$B$. Poriferans are pseudocoelomates
$C$. Aschelminthes are acoelomates
$D$. Platyhelminthes are pseudocoelomates
Choose the correct answer from the options given below:

The term "phylum" in animal classification was coined by

In which one of the following is the genus name,its two characters,and phylum $NOT$ correctly matched?

Match the following columns:

Column-$I$	Column-$II$
$I$. Choanocytes	$p$. Cnidaria
$II$. Cnidoblasts	$q$. Platyhelminthes
$III$. Flame cells	$r$. Porifera
	$s$. Aschelminthes