Tumors are genetically diverse with different mutations arising at different times throughout growth and development. Many models have tried to explain how genetic heterogeneity arises and what impact ...

Maize as we know it only became suitable for food after the tiny, hard, inedible ears of teosinte, the ancestor of corn, evolved, with the help of the first Mexican farmers, into the large, luscious ...

This is a preview. Log in through your library . Abstract Stomatal architecture-the number, form, and arrangement of specialized epidermal cells associated with stomatal guard cells-of 46 species of ...