Which event in Earth’s history was dependent on the development of a certain type of life-form?

According to fossil evidence, which sequence shows the order in which these four life-forms first appeared on Earth?

Which group of organisms, some of which were preserved as fossils in early Paleozoic rocks, are still in existence today?

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This evolutionary development from fish to amphibian is believed to have occurred during the

The gases in Earth's early atmosphere are inferred to have come primarily from

Much of the evidence for the evolution of lifeforms on Earth has been obtained by

Earth's fossil record shows evidence that

Which gas is inferred to have been absent from Earth's atmosphere during the Early Archean Era?

Theories of evolution suggest that variations between members of the same species give the species greater probability of

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Fossil evidence indicates that the earliest birds developed during which time interval?

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