Greenhouse effect - atmosphere traps additional heat (some light absorbed, some reflected. Reflected in form of infrared light. GE occurs when the atmosphere temporarily traps some of the infrared light that the ground emits, slowing its return to space.) Occurs only when the atmosphere contains gases that can absorb infrared light (greenhouse gases: H2O, CO2, methane (CH4).
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It was originally thought that archaea and eukaryotes were more closely related than bacteria and eukaryotes. However, evidence now supports the fact that both archaea and bacteria were responsible for the formation of more complex cells.
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