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the correct answer is c. he speculates on what might happen at given points in the future in a world without people. alan h. weisman is an american author, professor, and journalist. authors organize their information with a purpose. they present their ideas in an organized way. this is called text structure. weisman uses text structure so as to improve overall comprehension and to prove his points.

answer; /// the correct answer to the above statement is (a) because of the decline on native american labor forces;

i'm sorry i don't understand the question.