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Author Question: A severe drought affected several western states for 3 years. A Christmas tree farmer is worried ... (Read 3744 times) |
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.
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Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.
The small-scale distribution of different tree species in a Douglas-fir forest is determined by both
Several species of squirrels have melanistic phases. In large parts of United States and Canada, the