Explore the fascinating world of biology with "U- X- L(R) Complete Life Science Resource," featuring alphabetically arranged entries on theories, concepts and scientific discoveries and developments pertinent to the study of life science in schools today. Also featured is a chronology of discoveries with a timeline of world events, a general for further information section, and a research and activity section. This 3-vol. set contains illustrations, graphs and charts to help students understand such life science topics as: Human Body Systems and Life Cycles Plants, Animals and Classification Cells and Simple Organisms Reproduction and Heredity Populations and Ecosystems Regulation and Behavior Diversity and Adaptation And much more