anoxic event
(obsolete) A jackdaw. / (obsolete) A silly fellow.
An element of an educational curriculum concerned with bodily development, physical health and wellness, strength, physical co-ordination, and agility.
(chemistry) A period of time when large expanses ocean are depleted of dissolved oxygen.
plural of cheval de frise
地質学者たちは、数百万年前に海洋の溶存酸素が大幅に枯渇した期間が広範な海洋生物の絶滅を引き起こしたと考えている。
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