American missionaries and fruit planters led to the change in Hawii because the government eventually became involved and took over the Hawaii. They went ahead and converted the indigenous people who were living there into Christians. This was the major government change.
This is true because they only rely on their trades more than anything
While you didn't really provide the "following" as the comment above me states, in general, the advantage of secondary sources of primary ones is that they perhaps provide a more objective or even just a broader view on a certain topic. While a primary source of the American civil war would be a letter written by a soldier, a secondary source would be a book that describes more letters taken together and discusses possible information regarding them.
Field.
Agrobiology is the study of plant growth due to soil condition. Agriculture is the cultivation of different life forms for food, mainly it has to do with farming. Based on this, agros most likely has something to do with the field.
