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Why does Earth have an ultraviolet-absorbing stratosphere,while Venus and Mars do not?
Molecular Evidence
Information obtained from the molecular level, including DNA and proteins, that supports scientific theories or findings.
Carbon Isotopic Signatures
Differences in the ratio of carbon isotopes (carbon-12 to carbon-13) found in organic materials and carbonates, used as a tool for studying past environmental conditions and biological processes.
Diets
Pertains to the habitual nourishment or eating patterns of an individual or group, often tailored to specific health or nutritional goals.
Extinct Organisms
Species that no longer exist, having disappeared from their natural habitats and are no longer part of Earth's biodiversity.
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