The Constitution dictates that the presiding officer of the Senate is the Speaker of the House-<span>President pro tempore
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Although there are numerous factors that can affect a counties GDP, especially today when the entire world is so "connected", a major reason why GDP fluctuates so much in this part of the world is that these economies rely primary on agriculture, which can be profitable one year and then not profitable the next, due to weather changes.
The Cenozoic spans only about 65 million years, The Cenozoic is sometimes called the Age of Mammals, because the largest land animals have been mammals during that time.
The answer to the question is B