Describe the blood circulatory system of cockroach and draw its labelled diagran a13 Enumerate the characteristics of class mammalia. OR Describe the structure of human ear. Draw a well labelled diagram.

Describe the blood circulatory system of cockroach and draw its labelled diagran a13 Enumerate the characteristics of class mammalia. OR Describe the structure of human ear. Draw a well labelled diagram. Describe the structure of human ear. Draw a well labelled diagram.