Leeches are:

Which of the following is an invertebrate,triploblastic,and coelomate organism?

Which of the following animal groups exhibits bilateral symmetry,is coelomate,triploblastic,and shows metameric segmentation?

Which of the following species are earthworms?
$I-$ Nereis,$II-$ Pheretima
$III-$ Hirudinaria,$IV-$ Lumbricus
$V-$ Periplaneta

Assertion $A$: Metameric segmentation is observed in Annelids.
Reason $R$: The body of an Annelid is divided into two equal halves by a single axis.
Which option is correct for Assertion $A$ and Reason $R$?

Which organ do animals of the phylum $Annelida$ use for excretion?