Over geologic time, the concentration of 02 in Earth's atmosphere has increased. However, at the end of the period, the 02 concentration decreased significantly and was associated with . Devonian; rapid evolution of lineages Carboniferous; mass extinctions Cretaceous; rapid evolution of lineages O Cretaceous; mass extinctions Permian; mass extinctions

Over geologic time, the concentration of 02 in Earth's atmosphere has increased. However, at the end of the period, the 02 concentration decreased significantly and was associated with . Devonian; rapid evolution of lineages Carboniferous; mass extinctions Cretaceous; rapid evolution of lineages O Cretaceous; mass extinctions Permian; mass extinctions

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter18: Life's Origin And Early Evolution

Section: Chapter Questions

Problem 14SA: During the Precambrian, _______. a. atmospheric oxygen concentration declined b. bacteria, archaea,...

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