Answer:
Geographers use variety of maps and tools to represent the world because not a single type of map can show everything. They also use a variety of maps and tools to make it easier for the user.
Explanation:
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Answer:In 1947, Salk took a position at University of Pittsburgh, where he began conducting research on polio, also known as infantile paralysis. By 1951, Salk had determined that there were three distinct types of polio viruses and was able to develop a "killed virus" vaccine for the disease.
Explanation:
Answer:
Merriweather Lewis and William Clark are most known for their expedition from the Mississippi River to the West Coast and back. It was a long and dangerous journey that they both managed to complete and survive on.
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Im not too sure but i believe the anser is b
