Unit 5 · Animal Form and Function
Active and passive, natural and artificial immunity, how vaccines work and herd immunity (with Sri Lanka's immunisation programme), and the ABO and Rhesus blood groups and transfusion.
Deshapriya Senevirathne. B.Sc. (Hons) Biology Special, University of Peradeniya — graduated with a class pass. All the content and lessons in A/L Biology on Paadama are reviewed by Deshapriya Senevirathne, and the lessons are taught by him.