Why is it important that we learn about our solar system, the sun, and planets in our solar system other than Earth?

Which of the following best describes the economy of africa?

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 the answers for the following questions?