Oxygen came late to ocean depths during Paleozoic
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O2 levels rose and fell at the ocean floor long after marine animals appeared and diversified a half billion years ago.
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Cambrian fossil from Utah illuminates origins of vertebrate life
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Meet Nuucichthys, a 500-million-year-old fish-like creature recovered in Utah’s Marjum Formation in the West Desert and held in NHMU collections.
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