Sulfa drugs, such as antibiotics that contain sulfonamides. Example: Some combination drugs such as Sulfamethoxazole-trimethoprim (Septra, Bactrim) and Erythromycin-sulfisoxazole contain sulfonamides. <span>
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Water evaporates from the ocean and land surfaces, is held temporarily as vapour in the atmosphere, and falls back to Earth's surface as precipitation. ... Water that infiltrates Earth's surface becomes groundwater, slowly seeping downward into extensive layers of porous soil and rock called aquifers.
