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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
Exponential versus logistic growth.
Selected Factors Affecting the Release of Growth Hormone
Growth in Cold and Cool Clouds
Limiting factors restrain population growth
Growth Forecast from The Limits To Growth
Early growth of corn (Zea mays), a typical monocot.