A. Astronomers predicted eclipses and developed a 365-day calendar.
(CORRECT)
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B. The city of Machu Picchu was probably a retreat for nobility.
(INCORRECT)
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C. Scribes painted books and kept records of taxes and territories conquered.
(INCORRECT)
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D. Emperors communicated using runners from the capital city of Cuzco.
(CORRECT)
Its number 1: battle of san jacinto
1) First modern credit card introduced. 2) First organ transplant. 3) First "peanuts" cartoon strip introduced. 4) Korean war begins. 5) Senator Joseph Mccarthy begins communist witch hunt. 6) U.S president Truman orders construction of Hydrogen bomb. Hope this helps :)
