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TPO 30 /1
Passage 1 Role of Play in Development /1
Passage 2 The Pace of Evolutionary Change /7
Passage 3 The Invention of the Mechanical Clock /13

TPO 31 /19
Passage 1 Speciation in Geographically Isolated Populations /19
Passage 2 Early Childhood Education /21
Passage 3 Savanna Foemation /24

TPO 32 /29
Passage 1 Plant Colonization /29
Passage 2 Siam, 1851?D1910 /31
Passage 3 Distributions of Tropical Bee Colonies /34

TPO 33 /38
Passage 1 The First Civilizations /38
Passage 2 Railroad and Commercial Agriculture in Nineteenth-century United States /45
Passage 3 Extinction Episodes of the Past /50

TPO 34 /57
Passage 1 Islamic Art and the Book /57
Passage 2 The Development of Steam Power /62
Passage 3 Protection of Plants by Insects /67

TPO 35 /74
Passage 1 Earth’s Age /74
Passage 2 The Development of Social Complexity /80
Passage 3 Seasonal Succession in Phytoplankton /86

TPO 36 /93
Passage 1 Soil Formation /93
Passage 2 Early Ideas About Deep-sea Biology /99
Passage 3 Industrial Melanism: the Case of the Peppered Moth /106

TPO 37 /112
Passage 1 Thales and the Milesians /112
Passage 2 Direct Species Translocation /117
Passage 3 Modern Architecture in the United States /126

TPO 38 /135
Passage 1 Microscopes /135
Passage 2 The Raccoons’s Success /141
Passage 3 Transgenic Plants /148

TPO 39 /158
Passage 1 Early Writing Systems /158
Passage 2 The Extinction of Moa /161
Passage 3 Forest Fire Suppression /164

TPO 40 /168
Passage 1 Ancient Athens /168
Passage 2 Latitude and Biodiversity /170
Passage 3 Amphibian Thermoregulation /172

TPO 41 /175
Passage 1 Navajo Art /175
Passage 2 Climate of Venus /177
Passage 3 Trade and Early State Formation /179

TPO 42 /183
Passage 1 Geographic Isolation of Species /183
Passage 2 Explaining Dinosa