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Non-marine (live in water that is not seawater) diatoms are algae that require sunlight to
photosynthesize. Some diatoms are planktonic (live near the water surface) while others are
benthic (bottom dwelling, attached to rocks and gravel). Gwen, a graduate student, and her
undergraduate assistant, Lance, cored a closed basin lake (no outlet) in eastern North Dakota to
study how diatom floral assemblage changed over time and to infer how the climate or the
environment of the region changed. Look at the simplified diatom diagram shown below and
suggest how the climate, the environment, or some other factor(s) might have changed that are
consistent with the data presented.

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