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Wood first appeared in plants called progymnosperms.
Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
Earth’s history is divided into nested sets of time--eons, eras, periods, and epochs--and is called
In 1839 Mary Cragin, at the age of twenty-nine, became a convert to John Humphrey Noyes’s “communism
Eighteen-year-olds were the largest age cohort in the first year of the war in both armies. Soldiers
A Gaucher cell showing accumulated fat stored in structures called lysosomes