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This summer, workers removed large masses of algae from the lagoon to help prevent anoxia.

He reassured jurors that many of the medical terms they have heard during the trial — hypoxia, asphyxia, anoxia — all mean essentially the same thing, “a drastically low level of oxygen.”

In the case of the Cambrian it was periods of anoxia of as-yet-unknown cause.

Scientists had previously suspected that anoxia, or a lack of oxygen, was responsible for destroying aquatic life.

Global warming, acid oceans, anoxia, not to mention a toxic atmosphere.