Prokaryotes are multicellular are unicellular have differentiated cells have membrane-bound organelles do not have a membrane-bound nucleus are more primitive than eukaryotes

Blank 1 is Are unicellular .

Do not have a membrane bound nucleus

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1. desertification

2. captive breeding

3. black rhinoceros

4. renewable resources

explanation:

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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.