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Much of the evidence for the evolution of lifeforms on Earth has been obtained by
brachiopods
fish ® insects ® amphibians ® reptiles
examining fossils preserved in the rock record
addition of free oxygen to Earth’s atmosphere
surviving environmental changes
oxygen
Devonian Period
more complex life-forms probably have evolved from less complex life-forms
Which event in Earth’s history was dependent on the development of a certain type of life-form?
brachiopods
fish ® insects ® amphibians ® reptiles
examining fossils preserved in the rock record
addition of free oxygen to Earth’s atmosphere
surviving environmental changes
oxygen
Devonian Period
more complex life-forms probably have evolved from less complex life-forms
According to fossil evidence, which sequence shows the order in which these four life-forms first appeared on Earth?
brachiopods
fish ® insects ® amphibians ® reptiles
examining fossils preserved in the rock record
addition of free oxygen to Earth’s atmosphere
surviving environmental changes
oxygen
Devonian Period
more complex life-forms probably have evolved from less complex life-forms
Theories of evolution suggest that variations between members of the same species give the species greater probability of
brachiopods
fish ® insects ® amphibians ® reptiles
examining fossils preserved in the rock record
addition of free oxygen to Earth’s atmosphere
surviving environmental changes
oxygen
Devonian Period
more complex life-forms probably have evolved from less complex life-forms
This evolutionary development from fish to amphibian is believed to have occurred during the
brachiopods
fish ® insects ® amphibians ® reptiles
examining fossils preserved in the rock record
addition of free oxygen to Earth’s atmosphere
surviving environmental changes
oxygen
Devonian Period
more complex life-forms probably have evolved from less complex life-forms
Which group of organisms, some of which were preserved as fossils in early Paleozoic rocks, are still in existence today?
brachiopods
fish ® insects ® amphibians ® reptiles
examining fossils preserved in the rock record
addition of free oxygen to Earth’s atmosphere
surviving environmental changes
oxygen
Devonian Period
more complex life-forms probably have evolved from less complex life-forms
Which gas is inferred to have been absent from Earth's atmosphere during the Early Archean Era?
brachiopods
fish ® insects ® amphibians ® reptiles
examining fossils preserved in the rock record
addition of free oxygen to Earth’s atmosphere
surviving environmental changes
oxygen
Devonian Period
more complex life-forms probably have evolved from less complex life-forms
Earth's fossil record shows evidence that
brachiopods
fish ® insects ® amphibians ® reptiles
examining fossils preserved in the rock record
addition of free oxygen to Earth’s atmosphere
surviving environmental changes
oxygen
Devonian Period
more complex life-forms probably have evolved from less complex life-forms
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