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Wood first appeared in plants called progymnosperms.
Lampreys (sometimes also called lamprey eels) are a family of jawless fish
Herniated disk. A herniated disk is a protrusion of the disk’s gelatinous center, called the nucleus
Directionality of the hydrogen bond
People whose behaviors violate norms are often called mentally ill. “Why else would they do such ...
The WISER entry for hydrogen cyanide (bottom). Useful information includes detailed health ...