What killed more people during WWll?

A.) Diseases and infections
B.) Guns and bullets
C.) Bombs and shrapnel

Describe the technology advancements that lead to explorers being able to sail great distances. [[ps: doesn't explain where. i am only speculating it's in europe.

The establishment of columbia as the state capital was important because a) it was located in the heart of the upcountry. b) it was located in the heart of the low-country. c) it was already established as a vital industrial center. d) it represented a compromise location central to most citizens.

Why do many scientists suppose the land bridge theory of migration?