Boring Billion
Not bewildering.
(obsolete) Filled with care; anxious.
(geology) The period of time from 1.8 Gya to 800 Mya, on Earth, lying in the middle of the Proterozoic.
(rare, chiefly used in the singular) plural of Lebenswelt
地質学でいう18億年前から8億年前の10億年間では、酸素濃度は低いままで進化の革新は停滞しているように見えました。
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