Which natural event produces oxygen, which can then be used by humans and other organisms?
a. evaporation of water
b. respiration by consumers
c. photosynthesis by producers
d. chemosynthesis of sulfide

your answer is "the 1950's"

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.

it is either c or d and i know for sure it is not a or b

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.