Welcome to an exciting exploration of life through the pages of "Cambridge O Level Biology 5090," a book perfect for students preparing for their O Level exams in 2023, 2024, and 2025. This book is a treasure chest of knowledge about the amazing world of living things, how they work, and how they live together. Imagine starting a journey that takes you from tiny cells to the vastness of life itself. The book begins with cells, the tiny units that make up all life. You'll learn about their parts and what they do. Discover the variety of cells and how they join together to form tissues and organs, each with a special job. Next, the book takes you into the world of classifying life's great variety. This helps you understand how different life forms are grouped. Then, dive into the movements of substances in and out of cells. The book then guides you through the world of biological molecules and enzymes, crucial for life. You'll explore plant nutrition, like how plants make food through ph