Bacteria cells have a rigid cell wall that gives the bacteria its shape. The outermost structure of the bacteria cell is the capsule
, which comes in contact with the environment. Some bacteria have flagella
, or whiplike tails that spin to propel them forward.
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Copernican heliocentrism<span> is the name given to the astronomical </span>model<span> developed by </span>Nicolaus Copernicus<span> and published in 1543. It positioned the </span>Sun<span> near the center of the </span>Universe<span>, motionless, with Earth and the other planets rotating around it in circular paths modified by epicycles and at uniform speeds. The Copernican model departed from the </span>Ptolemaic<span> system that prevailed in </span>Western culture<span> for centuries, placing Earth at the </span>center of the Universe<span>, and is often regarded as the launching point to modern </span>astronomy<span> and the </span>Scientific Revolution.
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The indigenous peoples of the Americas arrived in North America via the Bering Strait land bridge, which existed approximately 15,000 years ago between Siberia and Alaska, and probably also via a succession of sea migrations from Asia.
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the Netherlands
The North Sea Floods
The Dutch and their ancestors have been working to hold back and reclaim land from the North Sea for over 2000 years. Beginning around 400 BCE, the Frisians were first to settle the Netherlands
