Mass production of steel, large suspension bridges, steel frame construction in buildings. It allowed impurities to be removed cheaply and easily, enabling steel to be produced in mass quantities.
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Answer:
aka communism is not great man
If you're asking for just two random explorers, then Meriwether Lewis and William Clark. But im not really sure if thats what youre asking or not...
213,000 can be rewritten as 2.13*10^5. This tells us that it has has 3 significant digits.
Your correct answer is b. It has three significant figures.
