To balance a chemical equation you must adjust the numbers that appear in front of an element or compound formula. these are called

What layer of the atmosphere is directly above the troposphere?

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?

While in europe, if you drive 125 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car’s gas mileage is 32.0 mi/gal? assume that 1 euro=1.26 dollars