| http://www.w3.org/ns/prov#value | - Current usage replaces Precambrian eon with three distinct eons, Hadean, Archean, and Proterozoic, with complex life forms only appearing at the end of the latter, during the Edicaran period. (MAK) More Primary producer: an autotroph that obtains energy directly from the nonliving environment through photosynthesis (e.g. a plant) or less commonly through chemosynthesis (some types of bacteria).
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