This completely updated third edition of Biological Oceanography: An Introduction offers students a firm grounding in the fundamentals of biological oceanography, continuing the work of the first and second edition author team, Carol Lalli and Timothy Parsons. Additionally, it provides an enhanced learning experience with numerous illustrations, thorough chapter summaries, and questions with answers and comments at the back of the book. The updated material now focuses on communicating the importance of the ocean for Earth’s habitability and as such, new chapters that present humanity’s dependence on the ocean are included. This comprehensive textbook is an invaluable resource for second year and higher undergraduate students studying oceanography and marine science.