The demand on the earth's lithosphere is dramatically increasing. why should we look for alternative sources of energy other than just relying on fossil fuels? a) fossil fuels are non-renewable and exhaustible and their combustion causes air pollution. b) fossil fuels are renewable and plentiful, but their combustion causes air pollution. c) fossil fuels are plentiful, so alternative sources are not needed. d) fossil fuels are not profitable for energy companies.

answer; /// i believe the correct answer is (reactants);

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.