What European county’s explorers are depicted by this map?

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.

Political boundaries are determined by the political party in control at the time. true or false

The creation of the trans-siberian railway allowed people to travel across russia. how could this railway impact russian culture?