In the analysis of a human disease and its pathology, researchers may apply different explanations, depending on the disease. If their interest is in the immediate mechanisms that cause the pathology, they will use explanations.

proximate

Explanation:

In evolutionary medicine, it is widely recognized that diseases have both proximate and evolutionary explanations that enable us to understand how natural selection may lead to the disease state.  

The questions raised under this idea are the following:  

- How is the mechanism leading to disease  

- Which is the ontogeny of the mechanism

- Which is the selective advantage of the disease state

- What is the evolutionary phylogenetics of the mechanism

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.

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