Plant populations change over time by growing in size and diversity. They generally are the first part of an ecosystem after lichens (the pioneer species) and cause an ecosystem to flourish and allow for animals to move in. I don't know if this is the answer you were looking for but it should give you somewhat of a base.
The sinking of the Lusitania in 1915 had a very negative effect on the American public opinion of Germany, since it was the Germans who sank the American ship for seemingly no reason.
Yes, it is true that the the role of some artists is to decorate functional objects, since artists are needed in all fields to do creative work that either other cannot do, or are too busy to do.
The correct answer should be the another one Powerful Executive
This was the major part of Jefferson's philosophy, the powerful executive.
