This comprehensive textbook by Amali Abdullah, published in 2009, delves into fundamental topics within the biological sciences. It provides a detailed exploration of human nutrition, the anatomy and physiology of the digestive system, and the intricate processes of digestion and absorption. The book also examines the significant role of microbes and future applications, alongside practical laboratory techniques like biological dyes and staining methods. It is an essential resource for students and researchers seeking a foundational understanding of these interconnected biological concepts.