1. natural environment; nutrient setting for microorganism.   Hint First letter clue   2. center of turbulence or whirling motion.   First letter clue   3. coloring agent.   First letter clue   4. substance which provides nourishment.   First letter clue   5. harmless substance given as dummy medicine.   First letter clue   6. array of numbers or symbols; mold or die.   First letter clue   7. marsh or soft and wet land.   First letter clue