Answer:
By first playing Italy, France and Britain against each other (they were trying to takeover Ethiopia), while this was happening, he built a large arsenal of modern weapons. When Italy advanced into Ethiopia, Menelik II declared war and successfully defeated the Italians and kept Ethiopia independent.
By definition a primary source is some king of source where the person that recorded it was actually there for the event, so the closest answer would be it describes an event from a historical perspective
I'm thinking that the shellfish could be affected by human activity in the harbor such as pollution.