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Author Question: Who starts the growth spurt earlier? a. boys b. girls c. It depends upon degree of physical ... (Read 65 times) |
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.