The great pyramids at giza are remarkable structures because a. they are still the most massive structures ever built by human effort
b. engineers have not figured out how they were built without modern technology
c.. they were the tallest man-made structures until the 20th century
d. they were the most massive man-made structures until the 20th century

Thesis statement for negative effects on immigration

What was a common theme of folk and rock music created by the 1960s counterculture? a. nonviolence b. hate c. self-denial d. aggression

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.