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:

$A$ shell,as a body covering,is not present in which of the following?

Which of the following organisms possess a four-chambered heart?

Given below are two statements:
Statement $I$: When any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry.
Statement $II$: In phylum Echinodermata, both adults and larvae are radially symmetrical.
In the light of the above statements, choose the most appropriate answer from the options given below:

All worms are ........

Make the correct pair:

$1. \text{ Osculum}$	$p. \text{ Fasciola}$
$2. \text{ Hypostome}$	$q. \text{ Ctenoplana}$
$3. \text{ Comb jellies}$	$r. \text{ Spongilla}$
$4. \text{ Hook and sucker}$	$s. \text{ Meandrina}$