Which organism appeared on earth first gastropods, horn corals, brachiopods, or crinoids

Why would the composition of a meteorite resemble the earth's interior?

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.

Which of the following statements about wearher along mountain ranges is correct