Answer:
C. Doctors have been unable to develop a vaccine.
Explanation:
The correct option is C.
The supremacy clause states that the under the constitution of the United States of America, the federal laws are superior to state laws, therefore in time of conflict between the federal and the state law, the state law has to bow to federal law. Thus, the supremacy clause is used when federal and state laws are in conflict.
Castelli is the term used to refer to the nine villages of san marino.
Answer:
The reason why many historians regard the printing press as the most important invention of the past millennium is because it allowed for thoughts and ideas--and thus things like revolutions and large-scale changes--to spread far more quickly and effectively.
Explanation:
