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Author Question: Due to the dominance of coal production in Appalachia, the United States has no major coal mining ... (Read 144 times) |
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Illicit drug use costs the United States approximately $181 billion every year.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.