Changes to the classification system have meant that the classification of some species of organisms has changed too. The system had to be changed to incorporate this new group or organisms.
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Folate would drive skin adopting a darker skin tone.
Darker pigmented skin tone. folate will be destroyed and they will not be successful reproducers.
Most fertilizers are made from animal (Cow most of the time) waste. The animal waste is high in animal byproducts which are mostly nitrogen and phosphorous.
I apologize that I can't give more of a specific answer without getting more background information for your unit.
1.dry and cold air mass 2. Dry and warm air mass 3. Humid and cold air mass 4. Humid and warm air mass