Biodiversity is the wide variety of life - plants, animals, fungi, and microorganism - that exists and interacts on the earth. Learn about the three types of diversity: species, genetic, and ecosystems working together. Detailed graphics, diagrams and video images help us understand the origin of the term biodiversity, the importance of genetic diversity, species diversity, ecosystem diversity, species abundance, the importance of biodiversity, and human impact on biodiversity. Multiple-choice reviews at the end of each segment reinforce important concepts.