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Biology for AP ® Courses
SENIOR CONTRIBUTING A UTHORS
JULIANNE ZEDALIS , BISHOP 'S SCHOOL
JOHN EGGEBRECHT , BROOKLYN TECHNICAL HIGH SCHOOL
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Table of Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Unit 1
Chapter 1: The Study of Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.1 The Science of Biology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.2 Themes and Concepts of Biology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Chapter 2: The Chemical Foundation of Life . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
2.1 Atoms, Isotopes, Ions, and Molecules: The Building Blocks . . . . . . . . . . . . . . . 42
2.2 Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
2.3 Carbon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Chapter 3: Biological Macromolecules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
3.1 Synthesis of Biological Macromolecules . . . . . . . . . . . . . . . . . . . . . . . . . 88
3.2 Carbohydrates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
3.3 Lipids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
3.4 Proteins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
3.5 Nucleic Acids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Unit 2
Chapter 4: Cell Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
4.1 Studying Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
4.2 Prokaryotic Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
4.3 Eukaryotic Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
4.4 The Endomembrane System and Proteins . . . . . . . . . . . . . . . . . . . . . . . . 166
4.5 Cytoskeleton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
4.6 Connections between Cells and Cellular Activities . . . . . . . . . . . . . . . . . . . . 178
Chapter 5: Structure and Function of Plasma Membranes . . . . . . . . . . . . . . . . . . . 195
5.1 Components and Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
5.2 Passive Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
5.3 Active Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
5.4 Bulk Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
Chapter 6: Metabolism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
6.1 Energy and Metabolism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
6.2 Potential, Kinetic, Free, and Activation Energy . . . . . . . . . . . . . . . . . . . . . . 242
6.3 The Laws of Thermodynamics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
6.4 ATP: Adenosine Triphosphate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
6.5 Enzymes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259
Chapter 7: Cellular Respiration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
7.1 Energy in Living Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282
7.2 Glycolysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286
7.3 Oxidation of Pyruvate and the Citric Acid Cycle . . . . . . . . . . . . . . . . . . . . . . 291
7.4 Oxidative Phosphorylation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296
7.5 Metabolism without Oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
7.6 Connections of Carbohydrate, Protein, and Lipid Metabolic Pathways . . . . . . . . . . 307
7.7 Regulation of Cellular Respiration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311
Chapter 8: Photosynthesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329
8.1 Overview of Photosynthesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330
8.2 The Light-Dependent Reaction of Photosynthesis . . . . . . . . . . . . . . . . . . . . 336
8.3 Using Light to Make Organic Molecules . . . . . . . . . . . . . . . . . . . . . . . . . . 347
Chapter 9: Cell Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365
9.1 Signaling Molecules and Cellular Receptors . . . . . . . . . . . . . . . . . . . . . . . 366
9.2 Propagation of the Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376
9.3 Response to the Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 382
9.4 Signaling in Single-Celled Organisms . . . . . . . . . . . . . . . . . . . . . . . . . . . 386
Chapter 10: Cell Reproduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403
10.1 Cell Division . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403
10.2 The Cell Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 408
10.3 Control of the Cell Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419
10.4 Cancer and the Cell Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426
10.5 Prokaryotic Cell Division . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430Unit 3
Chapter 11: Meiosis and Sexual Reproduction . . . . . . . . . . . . . . . . . . . . . . . . . 445
11.1 The Process of Meiosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 446
11.2 Sexual Reproduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 456
Chapter 12: Mendel's Experiments and Heredity . . . . . . . . . . . . . . . . . . . . . . . . 469
12.1 Mendel’s Experiments and the Laws of Probability . . . . . . . . . . . . . . . . . . . 470
12.2 Characteristics and Traits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 477
12.3 Laws of Inheritance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 494
Chapter 13: Modern Understandings of Inheritance . . . . . . . . . . . . . . . . . . . . . . 517
13.1 Chromosomal Theory and Genetic Linkages . . . . . . . . . . . . . . . . . . . . . . 518
13.2 Chromosomal Basis of Inherited Disorders . . . . . . . . . . . . . . . . . . . . . . . 524
Chapter 14: DNA Structure and Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . 543
14.1 Historical Basis of Modern Understanding . . . . . . . . . . . . . . . . . . . . . . . . 544
14.2 DNA Structure and Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 549
14.3 Basics of DNA Replication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 559
14.4 DNA Replication in Prokaryotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 562
14.5 DNA Replication in Eukaryotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 566
14.6 DNA Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569
Chapter 15: Genes and Proteins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 593
15.1 The Genetic Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 593
15.2 Prokaryotic Transcription . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600
15.3 Eukaryotic Transcription . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 604
15.4 RNA Processing in Eukaryotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610
15.5 Ribosomes and Protein Synthesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . 615
Chapter 16: Gene Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 635
16.1 Regulation of Gene Expression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 636
16.2 Prokaryotic Gene Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 639
16.3 Eukaryotic Epigenetic Gene Regulation . . . . . . . . . . . . . . . . . . . . . . . . . 645
16.4 Eukaryotic Transcriptional Gene Regulation . . . . . . . . . . . . . . . . . . . . . . . 649
16.5 Eukaryotic Post-transcriptional Gene Regulation . . . . . . . . . . . . . . . . . . . . 653
16.6 Eukaryotic Translational and Post-translational Gene Regulation . . . . . . . . . . . . 657
16.7 Cancer and Gene Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 659
Chapter 17: Biotechnology and Genomics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 677
17.1 Biotechnology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 678
17.2 Mapping Genomes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 693
17.3 Whole-Genome Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 697
17.4 Applying Genomics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 701
17.5 Genomics and Proteomics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 704
Unit 4
Chapter 18: Evolution and Origin of Species . . . . . . . . . . . . . . . . . . . . . . . . . . 719
18.1 Understanding Evolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 720
18.2 Formation of New Species . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 731
18.3 Reconnection and Rates of Speciation . . . . . . . . . . . . . . . . . . . . . . . . . 743
Chapter 19: The Evolution of Populations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 767
19.1 Population Evolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 768
19.2 Population Genetics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 774
19.3 Adaptive Evolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 783
Chapter 20: Phylogenies and the History of Life . . . . . . . . . . . . . . . . . . . . . . . . 807
20.1 Organizing Life on Earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 808
20.2 Determining Evolutionary Relationships . . . . . . . . . . . . . . . . . . . . . . . . . 815
20.3 Perspectives on the Phylogenetic Tree . . . . . . . . . . . . . . . . . . . . . . . . . 826
Unit 5
Chapter 21: Viruses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 849
21.1 Viral Evolution, Morphology, and Classification . . . . . . . . . . . . . . . . . . . . . 850
21.2 Virus Infection and Hosts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 857
21.3 Prevention and Treatment of Viral Infections . . . . . . . . . . . . . . . . . . . . . . 866
21.4 Other Acellular Entities: Prions and Viroids . . . . . . . . . . . . . . . . . . . . . . . 871
Chapter 22: Prokaryotes: Bacteria and Archaea . . . . . . . . . . . . . . . . . . . . . . . . . 889
22.1 Prokaryotic Diversity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 890
This OpenStax book is available for free at http://cnx.org/content/col12078/1.622.2 Structure of Prokaryotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 897
22.3 Prokaryotic Metabolism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 907
22.4 Bacterial Diseases in Humans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 911
22.5 Beneficial Prokaryotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 919
Unit 6
Chapter 23: Plant Form and Physiology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 945
23.1 The Plant Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 946
23.2 Stems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 948
23.3 Roots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 957
23.4 Leaves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 960
23.5 Transport of Water and Solutes in Plants . . . . . . . . . . . . . . . . . . . . . . . . 969
23.6 Plant Sensory Systems and Responses . . . . . . . . . . . . . . . . . . . . . . . . . 979
Unit 7
Chapter 24: The Animal Body: Basic Form and Function . . . . . . . . . . . . . . . . . . . 1017
24.1 Animal Form and Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1018
24.2 Animal Primary Tissues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1026
24.3 Homeostasis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1037
Chapter 25: Animal Nutrition and the Digestive System . . . . . . . . . . . . . . . . . . . 1057
25.1 Digestive Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1058
25.2 Nutrition and Energy Production . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1072
25.3 Digestive System Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1080
25.4 Digestive System Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1087
Chapter 26: The Nervous System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1107
26.1 Neurons and Glial Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1108
26.2 How Neurons Communicate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1116
26.3 The Central Nervous System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1130
26.4 The Peripheral Nervous System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1137
26.5 Nervous System Disorders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1142
Chapter 27: Sensory Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1165
27.1 Sensory Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1166
27.2 Somatosensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1170
27.3 Taste and Smell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1175
27.4 Hearing and Vestibular Sensation . . . . . . . . . . . . . . . . . . . . . . . . . . . 1180
27.5 Vision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1187
Chapter 28: The Endocrine System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1209
28.1 Types of Hormones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1209
28.2 How Hormones Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1213
28.3 Regulation of Body Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1217
28.4 Regulation of Hormone Production . . . . . . . . . . . . . . . . . . . . . . . . . . 1230
28.5 Endocrine Glands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1232
Chapter 29: The Musculoskeletal System . . . . . . . . . . . . . . . . . . . . . . . . . . . 1257
29.1 Types of Skeletal Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1258
29.2 Bone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1270
29.3 Joints and Skeletal Movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1278
29.4 Muscle Contraction and Locomotion . . . . . . . . . . . . . . . . . . . . . . . . . . 1287
Chapter 30: The Respiratory System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1309
30.1 Systems of Gas Exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1309
30.2 Gas Exchange across Respiratory Surfaces . . . . . . . . . . . . . . . . . . . . . 1318
30.3 Breathing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1324
30.4 Transport of Gases in Human Bodily Fluids . . . . . . . . . . . . . . . . . . . . . . 1332
Chapter 31: The Circulatory System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1349
31.1 Overview of the Circulatory System . . . . . . . . . . . . . . . . . . . . . . . . . . 1350
31.2 Components of the Blood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1354
31.3 Mammalian Heart and Blood Vessels . . . . . . . . . . . . . . . . . . . . . . . . . 1362
31.4 Blood Flow and Blood Pressure Regulation . . . . . . . . . . . . . . . . . . . . . . 1372
Chapter 32: Osmotic Regulation and Excretion . . . . . . . . . . . . . . . . . . . . . . . . 1393
32.1 Osmoregulation and Osmotic Balance . . . . . . . . . . . . . . . . . . . . . . . . . 1394
32.2 The Kidneys and Osmoregulatory Organs . . . . . . . . . . . . . . . . . . . . . . . 1398
32.3 Excretion Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140732.4 Nitrogenous Wastes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1410
32.5 Hormonal Control of Osmoregulatory Functions . . . . . . . . . . . . . . . . . . . . 1414
Chapter 33: The Immune System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1437
33.1 Innate Immune Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1438
33.2 Adaptive Immune Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1446
33.3 Antibodies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1461
33.4 Disruptions in the Immune System . . . . . . . . . . . . . . . . . . . . . . . . . . 1467
Chapter 34: Animal Reproduction and Development . . . . . . . . . . . . . . . . . . . . . 1487
34.1 Reproduction Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1488
34.2 Fertilization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1494
34.3 Human Reproductive Anatomy and Gametogenesis . . . . . . . . . . . . . . . . . 1496
34.4 Hormonal Control of Human Reproduction . . . . . . . . . . . . . . . . . . . . . . 1504
34.5 Fertilization and Early Embryonic Development . . . . . . . . . . . . . . . . . . . . 1510
34.6 Organogenesis and Vertebrate Formation . . . . . . . . . . . . . . . . . . . . . . . 1515
34.7 Human Pregnancy and Birth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1518
Unit 8
Chapter 35: Ecology and the Biosphere . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1539
35.1 The Scope of Ecology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1540
35.2 Biogeography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1545
35.3 Terrestrial Biomes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1552
35.4 Aquatic Biomes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1560
35.5 Climate and the Effects of Global Climate Change . . . . . . . . . . . . . . . . . . 1568
Chapter 36: Population and Community Ecology . . . . . . . . . . . . . . . . . . . . . . . 1593
36.1 Population Demography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1594
36.2 Life Histories and Natural Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 1600
36.3 Environmental Limits to Population Growth . . . . . . . . . . . . . . . . . . . . . . 1605
36.4 Population Dynamics and Regulation . . . . . . . . . . . . . . . . . . . . . . . . . 1611
36.5 Human Population Growth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1616
36.6 Community Ecology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1622
36.7 Behavioral Biology: Proximate and Ultimate Causes of Behavior . . . . . . . . . . . 1636
Chapter 37: Ecosystems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1683
37.1 Ecology for Ecosystems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1683
37.2 Energy Flow through Ecosystems . . . . . . . . . . . . . . . . . . . . . . . . . . . 1695
37.3 Biogeochemical Cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1702
Chapter 38: Conservation Biology and Biodiversity . . . . . . . . . . . . . . . . . . . . . 1727
38.1 The Biodiversity Crisis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1728
38.2 The Importance of Biodiversity to Human Life . . . . . . . . . . . . . . . . . . . . . 1739
38.3 Threats to Biodiversity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1743
38.4 Preserving Biodiversity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1754
Appendix A: The Periodic Table of Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1773
Appendix B: Geological Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1775
Appendix C: Measurements and the Metric System . . . . . . . . . . . . . . . . . . . . . . . . 1777
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1779
This OpenStax book is available for free at http://cnx.org/content/col12078/1.6PREFACE
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