Energy+and+Matter+Exchange+in+the+Biosphere

media type="custom" key="10499312"

media type="custom" key="10340748" media type="custom" key="10340756" media type="custom" key="10340762"

describe the geologic evidence (stromatolites) and scientific explanations for change in atmospheric composition, with respect to oxygen and carbon dioxide, from anoxic conditions to the present, and describe the significance to current biosphere equilibrium.