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What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cellaβs eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen
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Match the description of each organism to the appropriate category
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Glands that the body deal with stress and respond to emergencies.
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Light sensitivity in egulena is provided by the...
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