Answer:
B. Microscope
This is because like a telescope is used by an astronomer, a biologist uses a microscope.
Steel was critical in efforts to imperialists because steel doesn’t rust which need a criticize
It isn’t up to the states, so false
Answer:
The Cold War between the U.S. and Soviet Union originated from postwar disagreements, conflicting ideologies, and fears of expansionism. At both the Yalta Conference and Potsdam Conference, U.S. and Soviet leaders sharply disagreed over the future of the post-war world.

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The Cold War | Boundless US History
got it from ^
