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Online Biology Textbook
Animals of The World
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Biology is a fascinating subject. Learning about life on Earth is fun. Biology is the study of life, what life needs to survive, what makes life possible, how life evolves and changes, and how lifeforms interact with one another.
Explore our interactive Biology for Kids website and learn about the cell, the most basic unit of life. Or discover the different organs and systems found in your body. Learn how your body utilizes food to make energy and to help you grow.
Discover hundreds of animal species in our animal section. From the exotic to the everyday lifeforms that surround us.
Biology is an exciting subject. Let's learn together.