Organisms that live in tundra they must be adapted to little or no rain and to extreme temperature changes between the day and night

On the map below, which of the following rivers is identified by blue? the huang he river the yangtze river the han river the naktong river

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.

Based on the information in the graph, what can you conclude about humans in the world in general?