For Protists to Have Evolved During the Precambrian Period, Approximately

question 50

Multiple Choice

For protists to have evolved during the Precambrian period, approximately 800 MYA,

• A) the earth's atmosphere must have contained oxygen.
• B) the earth's atmosphere was still without oxygen.
• C) the earth's atmosphere consisted mainly hydrogen sulfide.
• D) the earth's atmosphere consisted mainly of methane.

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