Unit 3 · Evolution and Diversity of Organisms
The four chordate features, the invertebrate chordates, the vertebrate characters, and the diagnostic features and local examples of the classes Agnatha, Chondrichthyes, Osteichthyes, Amphibia, Reptilia, Aves and Mammalia.
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.