How many of the following phyla exhibit diploblastic and tissue-level organization?
Porifera,Coelenterata (Cnidaria),Ctenophora,Platyhelminthes,Aschelminthes

In which of the following is external fertilization observed?

Select the correct match for $X$ and $Y$:

Column $X$ (Phylum)	Column $Y$ (Example)
$(1)$ Protozoa	$(P)$ Bath sponge
$(2)$ Coelenterata	$(Q)$ Liver fluke
$(3)$ Porifera	$(R)$ Jellyfish
$(4)$ Platyhelminthes	$(S)$ Opalina

Fill in the blanks marked in the classification table of $Vertebrata$ from the choices provided below with respect to $A, B, C, D, E$ and $F$ and choose the correct option:
$I$. Pisces
$II$. Osteichthyes
$III$. Agnatha
$IV$. Gnathostomata
$V$. Chondrichthyes
$VI$. Cyclostomata
$A - B - C - D - E - F$

Which of the following is a correctly matched pair?

Which of the following pairs are correct?

Animal	Morphological Feature
$(i)$ Crocodile	$4$-chambered heart
$(ii)$ Sea cucumber	Echinodermata (Water vascular system)
$(iii)$ Obelia	Metagenesis
$(iv)$ Lemur	Thecodont