Science is a dynamic, constantly changing and evolving discipline. It is not simply a basket of facts, but a subject that is very active and needs to be learnt in this manner. Hence, this series is replete with investigations, discussions and thought-provoking questions. The series aims to build the spirit of inquisitiveness, which is a significant purpose of Science at this level. As scientific knowledge expands rapidly and new discoveries and inventions fill our lives, Revised Longman Active Science aims to prepare students to understand logic and reason and look for evidence and facts in their daily lives. Table of ContentsUnit 1: Plant Life1. Plants as Living Beings2. The Food FactoryUnit 2: Animal Life3. Animals as Living Beings4. Animals ReproduceUnit 3: The Human Body and Our Needs5. Food and Health6. Digesting Foo7. Our Teeth and Microbes8. Keeping Safe9. Clothes We WearUnit 4: Our Universe10. Our Universe: The Solar System11. Our Environment12. Weather, Air and WaterUnit 5: Materials and Matter13. Matter14. Force, Work and EnergyTest Paper 1 Test Paper 2.