How does the sun to protect life on earth?

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.

Based on current rates the earths human population is expected to grow how much by 2050

Find the slope of the line (6,4) and (3,2)