Define phylogeny.

What is haemocoel? Which groups of anirnals have haemocoel ?

Give one point of difference between Gymnosperms and Angiosperms.

Identify animal groups having

(a) Soft bodied animals supported by calcareous shells;

(b) Spiny body has radial body symmetry;

(c) Bones light and hollow;

(d) Four pairs of jointed legs and no wings;

(e) Extemal ear or pinna.

Give one example of hemichordata, urochordata and cephalochordata.