Why is it important for nitrogen to be recycled in an ecosystem? A. If nitrogen isn't recycled, there will be too much of it on Earth
B. Recycling nitrogen allows organisms to create more nitrogen
C. Recycling nitrogen allows organisms to create less nitrogen
D. The nitrogen cycle is a closed system, and recycling nitrogen is the only way to replenish it for an ecosystem

Graded assignment lab report answer the questions below. which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.