What is the primary mission of the twin rovers and the mars science laboratory (msl)?

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.

The ozone hole is at its biggest each year in the ? hemisphere in the ? season.

In a class of 20 students, what democratic form of governance makes the most sense