Read the following paragraph and select the sentence that describes an interaction. Yellowstone National Park was founded in 1872. It covers nearly 3,500 square miles of wilderness and contains many unusual geological features. The park is home to large populations of mammals, including bison and elk. For years, the elk population grew rapidly until the reintroduction of wolves to the park in 1995.

For years, the elk population grew rapidly until the reintroduction of wolves to the park in 1995.

Explanation:

An interaction is when two or more things encounter or meet together, come together, or get involved. The action occurs between two or more objects which will result in an effect of one kind or anything.

In the given passage, the interaction is seen in the sentence "For years, the elk population grew rapidly until the reintroduction of wolves to the park in 1995." This sentence describes or mentions the "interaction" of the elks and wolves, brought together and in one space/ location.

Thus, the correct answer is the fourth or last option.

the price of our current war is high; it costs money and it costs lives.

but it does not cost our pride. it does not cost the guilt that would arise from knowing that we did nothing to intervene while our neighboring nations fell to despotic leaders.

it does not cost the terror of knowing that our allies are unstable. it does not cost the fear that we, too, will be next to fall.

which sentence most accurately explains why the speaker's use of the parallel structure is effective in this passage?

a. it underscores that disagreement will not be tolerated and will be dealt with swiftly.

b. it makes the speaker seem like a decisive and capable leader.

c. it emphasizes reasons to fight and inspires listeners to aid the war effort.

d. it establishes the speaker's credibility by acknowledging the difficulties of war.