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Author Question: During which period does the blastocyst implant in the uterus? a. Within 24 hours after ... (Read 28 times) |
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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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.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.