This book comprehensively covers all the examinable areas of the KCSE Biology syllabus. Key biology concepts are summarized in clear and straightforward points, as well as neatly drawn illustrations which makes it easy for the student to digest and internalize the concepts. At the end of each chapter are well-thought out examination type questions and answers. At the end of the book is a collection of essay type questions from different topics. It is our believe that students of Biology will find this book a valuable companion and guide as they pursue their course.