4. until about 200 million years ago, earth's continents were joined as a single land mass called a. cynognathus. b. pangaea. c. glossopteris. d. asia minor.

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 process by which liquid water changes into water vapour is called what ?

When you start from a given set of rules and conditions and determine what must be true you are using blank reasoning