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Author Question: The element with the electron configuration 1s2 2s2 2p4 is ________. A) Be B) C C) O D) Si E) ... (Read 67 times) |
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
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There are 20 feet of blood vessels in each square inch of human skin.