What made land routes to asia dangerous in the 1492?

Which character are always present in all living organisms

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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.

How many battles in wwii were fought on u.s. soil? a. 0 b. 1 c. 2 d. 3