| 1.1 The Scientific Method
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| Observation allows us to draw tentative explanations called hypotheses.
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| A hypothesis makes predictions that can be tested by observation and experiments.
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| General explanations of natural phenomena supported by many experiments and observations are called theories.
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| 1.2 Chemical and Physical Principles
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| The living and nonliving worlds follow the same chemical rules and obey the same physical laws.
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| The scientific method shows that living organisms come from other living organisms.
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| Nucleic acids store and transmit information needed for growth, function, and reproduction.
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| Membranes define cells and spaces within cells.
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| Metabolism converts energy from the environment into a form that can be used by cells.
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| A virus is genetic material in need of a cell.
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| Variation in populations provides the raw material for evolution.
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| Evolution predicts a nested pattern of relatedness among species, depicted as a tree.
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| Evolution can be studied by means of experiments.
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| Basic features of anatomy, physiology, and behavior shape ecological systems.
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| Ecological interactions play an important role in evolution.
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