Write the most striking features of the following phyla:
$(i)$ Arthropoda
$(ii)$ Amphibia
$(iii)$ Porifera

You are given leech,Nereis,Scolopendra,prawn,and scorpion; all have a segmented body organization. Will you classify them in one group? If no,give the important characters based on which you will separate these organisms into different groups.

State whether the following statement is true or false:
The animals belonging to phylum Nematoda contain only tissues and no real organs.

$X, Y$ and $Z$ are living organisms.
$(a)$ Identify the group to which they belong on the basis of following features:
$(i)$ $X -$ Microscopic,unicellular,prokaryotic.
$(ii)$ $Y -$ Microscopic,unicellular,eukaryotic and shows locomotion with the help of pseudopodia/flagella.
$(iii)$ $Z -$ Multicellular,filamentous,eukaryotic,autotrophic and aquatic.
$(b)$ Which amongst the above is most advanced?
$(c)$ Name one organism each belonging to the groups of $X, Y$ and $Z$.

Identify the phylum of kingdom Animalia in which the animal has:
$(a)$ $A$ pseudocoelom
$(b)$ $A$ water-driven tube system
$(c)$ Jointed legs
$(d)$ Pores in the body leading to a canal system
$(e)$ Notochord at some stages of their life.

Name the five classes of vertebrates. Compare any two on the basis of their $(i)$ Habitat,$(ii)$ Covering of skin,$(iii)$ Respiratory organs,$(iv)$ Chambers of heart,and $(v)$ Reproduction.