give the characteristics of the following:

i) Body soft, bilaterally symmetrical.

ii) Coelomic cavity reduced.

iii) Open circulatory system present.

iv) Excretion by kidney-like organs or metanephridia.

v) Body divided into head, foot and visceral mass.

vi) Body cavity is haemocoel.

vii) Aquatic, mostly marine, a few fresh water and some terrestrial forms.