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From space earth shows itself as a planet covered mostly by water.
Mechanical ventilation. The photograph shows a patient receiving breathing assistance by the use of
Post–Main-Sequence Evolution
Harriet Beecher Stowe’s novel, Uncle Tom’s Cabin, became a staple of the mid-nineteenth-century thea
Genes are composed of a sequence of nucleotides in a DNA molecule
Major bone (tan) and cartilage (light blue) elements of the human skeleton. Inset shows regions of v