Spotlight Quick Revision Biology Form 3 and 4 has been uniquely designed to assist students quickly revise Biology topics taught at these levels. It is also intended to help candidates revising for their KCSE Biology papers 231/1,231/2 and 23 I /3.The book is also essential for teachers in the preparation of evaluation materials like Continuous AssessmentTests, End-of-Term and End-of-Year examinations. The book is well illustrated to help learners concretise contents taught at these levels.This book is presented in a clear, simple and precise language that makes revision stimulating and interesting. It covers all the 8 units taught in Form 3 and 4. The structure of the book is as follows: