$A$ blastula which is solid,is known as

Identify the type of digestive system in the organisms shown below.

Cleidoic eggs are a characteristic feature of which of the following?

Match the following and select the correct option:

Animal	Characteristics
$(a)$ Pila	$(1)$ Jointed appendages
$(b)$ Cockroach	$(2)$ Perching
$(c)$ Asterias	$(3)$ Water vascular system
$(d)$ Torpedo	$(4)$ Electric organ
$(e)$ Parrot	$(5)$ Presence of shell
$(f)$ Dog fish	$(6)$ Placoid scales

Give an example of the following:
$(a)$ Roundworm
$(b)$ Fish possessing poison sting
$(c)$ $A$ limbless reptile/amphibian
$(d)$ An oviparous mammal

$A$: Annelids,arthropods,and molluscs are protostomial coelomates.
$R$: All three phyla include members with bilateral symmetry and a true coelom.