Members of which group are not deuterostomes?

Match the following columns.

$a$. Cellular level of organisation	$1$. Cnidarians
$b$. Organ level of organisation	$2$. Platyhelminthes
$c$. Organ system level of organisation	$3$. Chordates
$d$. Tissue level of organisation	$4$. Porifera

Select the correct sequence for $a, b, c, d$.

Give an example of the following:
$(a)$ $A$ viviparous animal
$(b)$ $A$ fish possessing a poison sting
$(c)$ $A$ fish possessing an electric organ
$(d)$ An organ which regulates buoyancy
$(e)$ An animal which exhibits alternation of generation
$(f)$ An oviparous animal with mammary glands

$A.$ Animals are multicellular organisms composed of eukaryotic cells.
$R.$ Sponges do not perform photosynthesis and obtain nutrition by absorption.

Choose the correct combination of the following:

Some characteristics are given below:
$(1)$ Polymorphism $(2)$ Metagenesis $(3)$ Metamorphosis
$(4)$ Canal system $(5)$ Cnidoblast cells $(6)$ Blind sac body plan
Select the correct statement: