How much has the annual greenhouse gas index increased by percent from 1979 to 2017?
approximately 58%
approximately 42%
approximately 78%
D)
approximately 142%

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.

Fertility and mortality rates are higher in more developed nations.

How can studying economics us make better choices about how to use scare resources