<u>Answer:</u>
Eradicating smallpox was successful because of many reasons.
<u>Explanation:</u>
Smallpox was regularly found in an area or we can say it was prevalent in some places. So, mortality rates were high. It was caused by variola virus and affected mainly humans. So, it was essential that such vaccine is developed which can successfully immune people from this disease.
Smallpox vaccine then started spreading across "Europe and North America" and then gradually it spread all over the world and successfully eradicated smallpox by 1980. Other diseases that have been controlled by vaccines are “diphtheria, bacterial influenza, measles, mumps, rubella, and tetanus”.
Answer:
Two-Party System.
Explanation:
A two-party system is a type of party system where two parties dominate political life. In the countries described by the term, other parties are also legal and active, and therefore it should not be confused with a one-party state, where parties other than the ruling party are generally illegal, but these parties do not have almost any political relevance at the national level.
It has been stated, among other things, that such systems always offer two clear government alternatives, and that the relevance of personal elections is considered to increase, as personal positions on various issues become increasingly important.
For this I would choose the first choice, A. "Eileen bought pants but not a new jacket."
A complex sentence is formed by an independent and a dependent clause. An independent clause is a part of a sentence that can still be a sentence on it's own. For example, "Eileen bought pants." could be a valid sentence.
A dependent clause is the opposite, and is a part of a sentence that can not still be a sentence on it's own. "But not a new jacket." is not a valid sentence.
I hope this was helpful.
