Aims to educate and promote awareness of all things biology

Biology Online
Biology Online

Biology Online is the home for everyone who is interested in studying and becoming more familiar with biology, whether you are a teacher, student, scientist or anyone else who shares a passion for Biology.

The site aims to educate and promote awareness of all things regarding biology, offering free and easy access to information in the biological sciences.

Created in 2001, the site is the worlds most comprehensive database of biology terms, tutorials, and articles. With over 33 million visitors using the site on an annual basis.

The site is critically acclaimed for its simplicity, in both its design and the way in which it delivers content, helping users to find information easily, quickly and as a result more effectively.

All of the sites 75,000+ Biology terms and tutorials have been produced by our editorial staff of trained biologists, and were vetted and refined by the 285,000 members of our community. As members of the scientific community, we invite and appreciate all feedback related to the information presented on this site. Please contact us through the form below with any comments/suggestions, or ideas for partnership.


Biology Tutorials
Our Biology tutorials are invaluable learning tools for students, teachers, or professionals desiring to learn both fundamentals and advanced topics in Biology. All tutorials are interrelated so completing each lesson and then putting them together as a cohesive unit is the best approach to learn Biology.


  • Plant Biology
    Plant life can be studied at a variety of levels, from the molecular, genetic and biochemical level through organelles, cells, tissues, organs, individuals, plant populations, and communities of plants.


  • The Origins of Life
    Digging into the past and investigating the origins of life. Find out how life arrived on Earth, why, and how it evolved into its current diversity today. The section is split into geological periods in the form of a timeline.


  • The Human Physiology
    Physiology is the study of how living organisms function, viewed at the various levels of organization and integration within the body structure. The study of human physiology is especially vital, as disease states occur when the delicate balances in func


  • Human Neurology
    A closer look at the human nervous system, nerve cells and neurology in general, plus the various theories put forward by neurologists such as Freud and Jung and their analogies of the human brain and its inner workings.


  • Developmental Biology
    Human developmental biology looking at the creation and growth of humans from the meiotic stages in the creation of gametes to the aging of the mature adult.


  • Freshwater Ecology
    A look at the freshwater ecosystem and its components, including looking at the environment, biotic and abiotic factors and examples within the freshwater ecosystem.


  • Adaptation Tutorial
    Animal and plant water adaptations by means of natural selection and speciation over time.


  • Regulation of Biological Systems
    Looking at the principle of negative feedback, and how it controls blood/sugar, water and temperature in organisms. The tutorial also looks at monitoring populations and ecosystem succession.


  • Control of Growth & Development
    Looking at how our genetic make up determines our biological processes on a day to day basis, how enzyme induction works, and the various hormones and other factors involved in growth and development.


  • Genetics and Evolution
    Looking at the effects of Darwinism and Mendelian genetics, genetic engineering and selective breeding, and how genetics has led us to a greater understanding of evolution over time and the origins of man.


  • Cell Biology
    Studying the fundamental basics of cell biology, including DNA replication, protein synthesis and cell defence. Many aspects of cell biology are investigated here...