Plantae is the kingdom for all plants
This is still a reliable source because it clearly cites scientific research. Sometimes sources flatly contradict a given statement, study or an existing fact. In that case, there are things that we need to consider like the source of the evidence, is there outside evidence that supports one of the sources, and how do the conflicting sources fit with other existing facts present about the topic.
D is probably right cos you are comparing data
Answer:
all of the above can lead to increase in nitrogen
