Jonas Salk<span> </span><span>was an American </span>medical researcher<span> and </span>virologist<span>. He discovered and developed one of the first successful </span>polio vaccines in the 1950's.
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Industrialization has historically led to urbanization by creating economic growth and job opportunities that draw people to cities. ... This creates even more jobs and demands for housing, thus establishing an urban area.
Answer:
Height of power, systematic weaknesses.
Climatic worsening and plague.
Crisis of the Third Century.
Reunification and political division.
Growing social divisions.
Explanation:
thats all
Its just a fact. Can you please state the actual question? Thats how brainly works
Answer:
Independence Hall, Philadelphia, PA
Explanation:
