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Many animals live in a stream and many more live along its banks. This book features lots of original photos that illustrate in full color the variety of life in the stream ecosystem. This book explores the interconnected lives of fish, birds, and insects.

Not only are apples tasty and healthy but they and their trees support an intricate web of life. This book describes the world of the apple tree with many original photos and straightforward text that explains how the apple tree's ecosystem works. Readers will meet caterpillars that turn into moths, humming birds, and even beetles in this ecosystem.

Trees, insects, mushrooms, and birds are just four of the millions of different things in the world. How do we keep track of them all? asks author Elaine Pascoe. Animals With Backbones proceeds to explain just that. With information on backbones plus the unique traits of fish, amphibians, reptiles, birds, and mammals, this book will have students excited about the animal kingdom.

The world of mosses, ferns, and other plants that do not produce seeds is clearly explained in beautiful simplicity. With explanations about the differences between plants and animals and the many types of seedless plants, Plants Without Seeds offers a friendly introduction to the different groups of plants that use spores to reproduce.

The engineering designer is always limited by the properties of available materials. Some properties are critically affected by variations in com- position, in state or in testing conditions, while others are much less so. The engineer must know this if he is to make intelligent use of the data on properties of materials that he finds in handbooks and tables, and if he is to exploit successfully new materials as they become available. He can only be aware of these limitations if he understands how pro- perties depend on structure at the atomic, molecular, microscopic and macroscopic levels....