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A biofilm composed of a community of microorganisms glued by mucilage to a surface.
The American Lion was one of the abundant Pleistocene megafauna, a wide variety of very large mammal
This portrait of Thomas Jefferson is considered an accurate likeness, painted when he was thirty-sev
American Foreign Trade, 1790–1812
Most Americans obtain their drinking water from a community water system
The National School Lunch Program