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Author Question: Oxygen is supplied to the atmosphere by a. ozone. b. incomplete combustion. c. photosynthesis. ... (Read 32 times) |
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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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.
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Cyanide works by making the human body unable to use oxygen.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.