SUBJECT AREA REVIEW 2 Biochemistry 3 The Cell 4 Cell Cycle 5 Energy, Metabolism, and Enzymes 6 Cell Respiration 7 Photosynthesis 8 Heredity 9 The Molecular Basis of Inheritance 10 Biological Diversity 11 Evolution 12 Plants 13 Human Physiology 14 Endocrine and Nervous Systems 15 The Human Immune System 16 Animal Reproduction and Development 17 Ecology 18 Animal Behavior 19 Investigations 20 Learn How the College Board Grades Your Essay