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Author Question: One of the basic distinguishing features of the human species was a. the ability to make tools b. ... (Read 38 times) |
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The horizontal fraction bar was introduced by the Arabs.
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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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There are 60,000 miles of blood vessels in every adult human.