Greatest 3 digit number exactly divisible by 810 and 12

The coco river is a natural border between nicaragua and which other country

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.

Many rivers in central asia come from