Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.
Tracking time of marker entry generates a chromosome map
An Estimate of the Time of Global Peak Conventional Oil Production
In middle childhood, children spend increasing amounts of time with peers and friends.
Time course of HIV infection.
Estimated number of new HIV infections per year over time period in Canada