It's a big world out there, and it's populated with millions of different species of plants, animals, and microorganisms! Biodiversity: Explore the Diversity of Life on Earth with Science Activities for Kids introduces middle school readers to the evolution of life on Earth, beginning with the first single-celled organisms that emerged 3.8 billion years ago to the complex multi-celled organisms that exist today and make up the tree of life. Science-minded, hands-on experiments make this a book a fully immersive learning experience!