Differentiate between:

Open and closed circulatory system

Differentiate between:

Oviparity and viviparity

Differentiate between:

Direct and indirect development

Differentiate between:

Acoelomate and pseudocoelomate

Differentiate between:

Notochord and nerve cord

Differentiate between:

Polyp and medusa

Give the characteristic features of the following citing one example of each

Chondrichthyes and Osteichthyes

Give the characteristic features of the following citing one example of each

Urochordata and cephalochordata