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Wood first appeared in plants called progymnosperms.
Bay (left) and chestnut (sometimes called "sorrel") are two of the most common coat colors
The pancreas. This organ sits just below the stomach and is both an exocrine and an endocrine gland.
Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
The illusory bands visible in this figure are often called Mach bands, although Mach used a ...
A thin cleft, called the synapse, separates one cell from another.