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Projector bulbs were starting to dim and teachers would have to turn off classroom lights to use the projectors, creating a low-energy environment. Some of the interactive whiteboard software was out of date, and not all schools had the funding to upgrade obsolete equipment.
Scott (1990) listed the environmental factors necessary for dominance of detritus-feeding nereinids as muddy substrates, plus stable, low-energy environments. In contrast, offshore dominance of nerineids in coarse substrate, high-energy environments is documented by Barker (1990) for Jurassic rocks of Europe.

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