Over time, certain areas of the forest ecosystem in the United States have decreased in size. Also, through a process called fragmentation, the ecosystem has been broken up into several isolated areas. One result of fragmentation is that more parts of the forest ecosystem now lie exposed to adjacent open lands.

Cowbirds are a species of bird that live in these open lands next to forests. Cowbirds lay eggs in the nests of other bird species, called host species. When a cowbird egg hatches, the unsuspecting host parent raises the cowbird as offspring. Often, a cowbird hatchling outcompetes or kills all the host species' offspring that share the nest. This results in a decrease in the host species' population and an increase in the cowbird population. Based on this information, how does forest fragmentation affect species of forest birds? A. It benefits their populations by protecting their nests from cowbirds. B. It threatens their populations by exposing their nests to more cowbirds. C. It threatens their populations by protecting their nests from cowbirds.

In which part of this excerpt from the gettysburg address does president abraham lincoln argue that the outcome of the war will depend on the determination and loyalty of northern citizens? four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in liberty, and dedicated to the proposition that all men are created equal. now we are engaged in a great civil war, testing whether that nation, or any nation so conceived and so dedicated, can long endure. we are met on a great battle-field of that war. we have come to dedicate a portion of that field, as a final resting place for those who here gave their lives that that nation might live. it is altogether fitting and proper that we should do this. but, in a larger sense, we can not dedicate—we can not consecrate—we can not hallow— this ground. the brave men, living and dead, who struggled here, have consecrated it, far above our poor power to add or detract. the world will little note, nor long remember what we say here, but it can never forget what they did here. it is for us the living, rather, to be dedicated here to the unfinished work which they who fought here have thus far so nobly advanced. it is rather for us to be here dedicated to the great task remaining before us— that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion—that we here highly resolve that these dead shall not have died in vain—that this nation, under god, shall have a new birth of freedom—and that government of the people, by the people, for the people, shall not perish from the earth.