Gaseous ammonia chemically reacts with oxygen (O2) gas to produce nitrogen monoxide gas and water vapor. Calculate the moles of ammonia needed to produce 0.055 mol of water. Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits

Pretty sure it's d. heterogeneous is separated by physical properties. 

For lesson: cameras, plant presses, newspaper, paper towels, clip boards, pencils, calculators, field guides, metric measuring tapes, paper, transect squares, colored pencils, ph meters, light meters, computers, etc.for extension: baggies for soil samples collecting, distilled water, hand shovels, beakers, boiled rice, microscopes, well microscope slides or regular microscope slides with cover slips

Ithink scientist use creativity by asking questions about the natural world by using prior knowledge to solve problems.