Dravidian, Indo-European, Japonic, and Uralic are all examples of dying languages
developing languages
language branches
language families
threatened languages

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.