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Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%
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Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled
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This rapid change in species that rarely leaves behind fossil evidence is referred to as
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Which of the following is not a benefit of genetically modified foods? a.pest-resistant crops b.herbicide-resistant crops c.plants that do not require water?
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An increase number of mitochondria in muscle cells would enable an individual to obtain energy from...
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