In biology, a well-labeled diagram often carries more marks than a page of text. Trace the diagrams in the book until you can draw them from memory.
A.K. Berry is likely a renowned embryologist who has made significant contributions to the field. While I couldn't find specific information on A.K. Berry's work, I can suggest that they might have authored or co-authored a textbook or research articles on embryology. an introduction to embryology by ak berry pdf upd