These engaging books provide a clear introduction to science and the environment. Find out how human activities are affecting our planet and what we can do to help. Short blocks of text, lively photos, and attractive artwork make concepts easy to understand. A quiz at the end of each book lets readers test what they've learned. Biodiversity, Earth is home to a variety of plants and animals. This rich mixture is biodiversity. Find out why it is important for the planet, why it is under threat, and what we can do to help.