The correct answer is - Large numbers of migratory birds;
The number of the migratory birds has always been pretty high and it hadn't resulted in the drying up of the Ogallala Aquifer, not to mention that those birds can not even reach that water because it is underground. Also, the number of the migratory birds have been steadily lowering, so even if they were using that water for drinking, it wouldn't have caused the drying out.
The Ogallala Aquifer has started to dry out because of numerous reasons, with the usage of its water for irrigation being the prime reason. The droughts have become longer, and the temperatures little higher, while the rainfall slightly smaller, so all of that affected the reserves of water in the aquifer negatively.
Musicals emerged primarily from the European Operetta which is a lighter version of the popular opera.
The operetta is a drama-musical production that is almost like the opera structurally. But the difference is that the plot is usually full of romance dramas alongside with music.
A lot of dance scenes and dialogues are also incorporated in them. One big difference was that the operettas were usually shorter than the operas.
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Theodore Roosevelt
William Howard Taft
and Woodrow Wilson
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Malcolm X promoted that idea of "separating the races" of white and black as one of the answers to the race problem in the United States, since he believed the two races could never truly live peacefully in a fully-integrated society.
Answer:
The U.S provides countries with assistance in fighting against infectious diseases