Si ______ en los Estados Unidos, tendríamos Donald Trump como Presidente en vez de Justin Trudeau, el Primer Ministro de Canadá. A. vivimos B. vivíamos C. viviéramos D. viviremos

The answer would be C. viviéramos because that is the imperfect subjunctive. The imperfect subjunctive must be used with an 'if' ('si') clause, especially when followed by the conditional tense ('tendríamos').

Damage to the medulla will most likely cause what sort of problem(s)?

The medulla is one of the most important areas of the brain because it regulates life-essential and automatic functions. If the medulla is damaged, issues with breathing, heart rate, and blood pressure can occur, making damage life-threatening.

What are the key characteristics of the American literary movement Transcendentalism?

Some of the key characteristics are radical thinking and ideas, the belief in a distinct relationship between the self and the universe, intuition, and self-reliance. The Transcendentalists, like Thoreau and Emerson, believed also in, and emphasized, the importance of Nature and imagination.