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原げん生せい代だいは、酸さん素そ濃のう度どが上じょう昇しょうし始はじめた時じ代だいです。

Span Details

原げん生せい代だい

Proterozoic era

酸さん素そ濃のう度ど

oxygen concentration; oxygen content

noun

上じょう昇しょう

rise; increase; climb; ascend

noun, suru verb, no-adjective

し始はじめ

begin doing; start doing

-> し始めるichidan verb

past tense or completed action

時じ代だい

period; epoch; era; age