The Living World
Explore the diversity of living organisms, understand biodiversity, learn about nomenclature, taxonomy, systematics, and the complete taxonomic hierarchy from species to kingdom.
Topics
Introduction to The Living World
Discover what biology is, how early humans related to the natural world, and why the study of life eventually led to structured systems of identification, naming, and classification.
Diversity in the Living World
Explore the breathtaking diversity of life on Earth, understand what biodiversity means, and learn why standardised naming of organisms became essential. Meet Ernst Mayr, the scientist who reshaped evolutionary biology.
How Organisms Get Their Scientific Names — Nomenclature
Understand the binomial nomenclature system created by Carolus Linnaeus, the international codes that govern naming, and the universal rules every scientific name must follow.
Organising Life — Classification, Taxonomy and Systematics
Understand how organisms are grouped through classification, explore the science of taxonomy and its four foundational processes, and learn how systematics adds an evolutionary dimension.
Building the Ladder — Taxonomic Categories, Species and Genus
Learn how classification is structured as a hierarchy of ranks, understand what a taxonomic category is, and explore the two lowest levels: species (the fundamental unit) and genus (a cluster of related species).
Climbing Higher — Family, Order and Class
Explore the intermediate taxonomic ranks: how related genera form a family, how related families form an order, and how related orders form a class, with examples from both plants and animals.
The Top of the Ladder — Phylum, Kingdom and the Complete Hierarchy
Understand phylum (division in plants) and kingdom as the broadest taxonomic ranks, see the full hierarchy in action with four common organisms, and grasp the key principles that govern classification.