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Furchgott's discovery that endothelial cells produce a vasodilating substance.
A guanacaste tree, Enterolobium cyclocarpum, growing in Costa Rica. Guanacaste trees, which produce
How to convert verbal statements into algebraic equations (Part 2)
Many countries do not produce enough food and need to import food from the United States
Diagrams a mitotic chromosome, showing how chromatin is condensed to produce it
The large, white flowers of giant saguaro cactus (Carnegiea gigantea) produce sweet nectar. The flow