Identity 3 underwater geographic physical features identified in the caribbean region

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.

What are some of the impacts of humans on the earth?

How are the arctic and antarctic circles alike?