Why this constitution is called a federal democratic Republic constitution ?

According ti the following map, what are the most common mineral resources found in the united states?

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d

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.