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The Precambrian (or Pre-Cambrian) is the large span of time in Earth's history before the current Phanerozoic Eon, and is a Supereon divided into several eons of the geologic time scale. It spans ...
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The Archean Eon (/ɑrˈkiːən/, also spelled Archaean; formerly Archaeozoic /ɑrkiːəˈzoʊɪk/), also spelled Archeozoic or Archæozoic) is a geologic eon before the Proterozoic Eon, before 2.5 Ga (billion ye ...
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Photosynthesis is a process used by plants and other autotrophic organisms to convert light energy, normally from the sun, into chemical energy that can be used to fuel the organisms' activities. ...
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