Anong bansa ang nanguna sa telang sutla

Orion the hunter is known for two navigational stars. which pair of stars are they?

What causes the cyclical changes in the appearance of the moon?

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.