TPO 1, Test 1 ······························1
Timberline Vegetation on Mountains
TPO 1, Test 2 ······························6
The Origins of Theater
TPO 1, Test 3 ····························12
Groundwater
TPO 2, Test 1 ····························16
Desert Formation
TPO 2, Test 2 ····························22
The Origins of Cetaceans
TPO 2, Test 3 ····························25
Early Cinema
TPO 3, Test 1 ····························29
Architecture
TPO 3, Test 2 ····························34
Depletion of the Ogallala Aquifer
TPO 3, Test 3 ····························40
The Long-Term Stability of Ecosystems
TPO 4, Test 1 ····························45
Deer Populations of the Puget Sound
TPO 4, Test 2 ····························51
Cave Art in Europe
TPO 4, Test 3 ····························55
Petroleum Resources
TPO 5, Test 1 ····························60
Minerals and Plants
TPO 5, Test 2 ····························65
The Origin of the Pacific Island People
TPO 5, Test 3 ····························71
The Cambrian Explosion
TPO 6, Test 1 ····························76
Powering the Industrial Revolution
TPO 6, Test 2 ····························80
William Smith
TPO 6, Test 3 ····························84
Infantile Amnesia
TPO 7, Test 1 ····························88
The Geologic History of the Mediterranean
TPO 7, Test 2 ····························93
Ancient Rome and Greece
TPO 7, Test 3 ··························100
Agriculture, Iron, and the Bantu Peoples
TPO 8, Test 1 ··························105
The Rise of Teotihuacan
TPO 8, Test 2 ··························110
Extinction of the Dinosaurs
TPO 8, Test 3 ··························115
Running Water on Mars
TPO 9, Test 1 ··························121
Colonizing the Americas via the Northwest Coast
TPO 9, Test 2 ··························125
Reflection in Teaching
TPO 9, Test 3 ··························130
The Arrival of Plant Life in Hawaii
TPO 10, Test 1 ························135
Chinese Pottery
TPO 10, Test 2 ························141
Variations in the Climate
TPO 10, Test 3 ························146
Seventeenth-Century European Economic Growth
TPO 11, Test 1 ·························152
Ancient Egyptian Sculpture
TPO 11, Test 2 ·························157
Orientation and Navigation
TPO 11, Test 3 ·························162
Begging by Nestlings
TPO 12, Test 1 ························167
Which Hand Did They Use?
TPO 12, Test 2 ························172
Transition to Sound in Film
TPO 12, Test 3 ························178
Water in the Desert
TPO 13, Test 1 ························183
Types of Social Groups
TPO 13, Test 2 ························188
Biological Clocks
TPO 13, Test 3 ························193
Methods of Studying Infant Perception
TPO 14, Test 1 ························198
Children and Advertising
TPO 14, Test 2 ························203
Maya Water Problems
TPO 14, Test 3 ························209
Pastoralism in Ancient Inner Eurasia
TPO 15, Test 1 ·······················215
Glacier Formation
TPO 15, Test 2 ·······················219
A Warm-Blooded Turtle
TPO 15, Test 3 ·······················223
Mass Extinctions
TPO 16, Test 1 ·······················229
Trade and the Ancient Middle East
TPO 16, Test 2 ·······················235
Development of the Periodic Table
TPO 16, Test 3 ·······················239
Planets in Our Solar System
TPO 17, Test 1 ························243
Europe''s Early Sea Trade with Asia
TPO 17, Test 2 ·······················249
Animal Signals in the Rain Forest
TPO 17, Test 3 ·······················253
Symbiotic Relationships
TPO 18, Test 1 ·······················259
Industrialization in the Netherlands and Scandinavia
TPO 18, Test 2 ·······················265
The Mystery of Yawning
TPO 18, Test 3 ·······················270
Lightning
TPO 19, Test 1 ·······················274
The Roman Army''s Impact on Britain
TPO 19, Test 2 ························281
Succession, Climax, and Ecosystems
TPO 19, Test 3 ························287
Discovering the Ice Ages
TPO 20, Test 1 ·······················291
Westward Migration
TPO 20, Test 2 ························296
Early Settlements in Southwest Asia
TPO 20, Test 3 ························301
Fossil Preservation
TPO 21, Test 1 ·······················307
Geothermal Energy
TPO 21, Test 2 ·······················311
The Origins of Agriculture
TPO 21, Test 3 ·······················317
Autobiographical Memory
TPO 22, Test 1 ·······················322
Spartina
TPO 22, Test 2 ·······················328
The Birth of Photography
TPO 22, Test 3 ·······················334
The Allende Meteorite
TPO 23, Test 1 ·······················339
Urban Climates
TPO 23, Test 2 ·······················345
Seventeenth-Century Dutch Agriculture
TPO 23, Test 3 ·······················350
Rock Art of the Australia Aborigines
TPO 24, Test 1 ·······················356
Lake Water
TPO 24, Test 2 ·······················361
Breathing During Sleep
TPO 24, Test 3 ·······················365
Moving into Pueblos
TPO 25, Test 1 ·······················371
The Surface of Mars
?TPO 25, Test 2 ·······················375
The Decline of Venetian Shipping
TPO 25, Test 3 ·······················380
The Evolutionary Origin of Plants
TPO 26, Test 1 ························386
Energy and the Industrial Revolution
TPO 26, Test 2 ························391
Survival of Plants and Animals in Desert Conditions
TPO 26, Test 3 ························397
Sumer and the First Cities of the Ancient Near East
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