________ conducted an experiment mimicking a volcanic explosion in addition to his classic 1953 research.
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Radiometric dating
________ and other methods can be used to estimate the ages of fossils.
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Adaptive radiations
________ have also occurred in groups of species that possessed significant evolutionary advances or colonized new areas with minimal competition from other creatures.
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organic molecules
The abiotic (nonliving) synthesis of small ________, such as amino acids and nitrogenous bases.
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Plate tectonics
________ describes the slow movement of continental plates through time, affecting the physical geography and climate of the Earth, resulting in extinctions in some groups and speciation in others.
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fossil record
The ________ demonstrates how new groupings of creatures can emerge through the progressive alteration of preexisting ones.
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broad pattern of evolution
The term*** macroevolution*** refers to the sweeping changes in life on Earth as revealed by fossils of which the ________ is above the species level.
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Natural selection
________ in a changing environment or species selection as a consequence of interactions between organisms and their present habitats can both generate evolutionary trends.
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Fossils of microbes
________ that existed 3.5 billion years ago provide direct proof of life on early Earth.
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Adaptive radiations
________ that occurred after catastrophic extinctions resulted in significant increases in biological variety.
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