Root plant to fuel the process. In return, the plant takes nitrogen compounds produced from ammonia by the bacteria. The term root crops refers to any edible underground plant structure, but many root crops are actually stems, such as potato tubers. Edible roots include cassava, sweet potato, beet, carrot, rutabaga, turnip, parsnip, radish, yam and horseradish. Spices obtained from roots include sassafras, angelica, sarsaparilla and licorice. Sugar beet is an important source of sugar. Yam roots are a source of estrogen compounds used in birth control pills. The fish poison and insecticide rotenone is obtained from roots of "Lonchocarpus" spp. Important
Wine tasting both experts and consumers have surfaced through scientific blind wine tasting, such as inconsistency in identifying wines based on region and price. The Sumerian stories of Gilgamesh in the 3rd millennium BCE differentiate the popular beers of Mesopotamia, as well as wines from Zagros Mountains or Lebanon. In the fourth century BCE, Plato listed the main flavors of wine, and classified the aromas as "species", or families. Aristotle proposed a sensory tasting defined by the four elements (air, water, fire, and earth) further deepened by the Roman noblewoman Lucretia in the first century BCE. Although the practice of tasting is