Cover -- Title Page -- Copyright Page -- Contents -- About Our Authors -- About Research & Education Association -- Chapter 1 Passing the CLEP Natural Sciences Exam -- Getting Started -- The REA Study Center -- An Overview of the Exam -- All about the CLEP Program -- Options for Military Personnel and Veterans -- SSD Accommodations for Candidates with Disabilities -- 6 -Week Study Plan -- Test-Taking Tips -- The Day of the Exam -- Part I -Biological Science -- Chapter 2 Evolution -- History of Evolutionary Concepts -- Plant and Animal Evolution -- Chapter 3 Cellular and Molecular Biology -- The Structure and Function of Cells -- Chemical Nature of the Gene -- Chapter 4 Structure and Function of Plants and Animals -- Genetics -- Plants (Botany) -- Animals (Zoology) -- Principles of Heredity (Genetics) -- Chapter 5 Ecology and Population Biology -- Ecology -- Population Growth and Regulation -- Biomes -- Principles of Behavior -- Social Biology -- Part II -Physical Science -- Chapter 6 Atomic Chemistry -- Structure of the Atom -- Periodic Trends -- Nuclear Reactions and Equations -- Rate of Decay -- Half-Life -- Chapter 7 Chemistry of Reactions -- Common Elements -- Chapter 8 Physics -- Heat -- The Laws of thermodynamics -- States of Matter -- Classical Mechanics -- Theory of Relativity -- Chapter 9 Energy -- Electricity and Magnetism -- Waves: Sound and Light -- Chapter 10 the Universe -- Astronomy -- Chapter 11 Earth -- Atmosphere -- Earth's Layers -- Practice Test 1 -- Answer Key -- Detailed Explanations of Answers -- Practice Test 2 -- Answer Key -- Detailed Explanations of Answers -- Glossary -- Index.