There are 60,000 miles of blood vessels in every adult human.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Adults are resistant to the bacterium that causes Botulism. These bacteria thrive in honey – therefore, honey should never be given to infants since their immune systems are not yet resistant.
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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
A simplified food web from an African savannah ecosystem
Heliospheric-current-sheet
Classical Conditioning and Food
Basic Chart of Food Chain
Question About VSEPR Shape
The medulla and the midbrain are largely developed at birth