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Rank the following ecosystems in order of their net primary productivity, from lowest to highest: a) open ocean. b) tropical rain forest. c) desert. d) lake.
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In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls
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Scientific evidence is most likely to be consistent if it is based on data from
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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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Explain the causes and effect of damage to the genetic code.
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Rank the following ecosystems in order of their net primary productivity, from lowest to highest: a...
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