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Wood first appeared in plants called progymnosperms.
Cerebral angiography. The four angiograms each reveal the distribution of blood vessels supplying th
Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
Eighteen-year-olds were the largest age cohort in the first year of the war in both armies. Soldiers
With the research technique called brainbow, each neuron is labeled with a different color, ...
A thin cleft, called the synapse, separates one cell from another.