In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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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The human body produces and destroys 15 million blood cells every second.
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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
Balding Male Chimpanzee
Chromosomes and the DNA molecule
Procedures and Diagnostic Tests Related to the Male Reproductive System
The development of the internal ducts of the male and female reproductive systems from the Wolffian ...
