(1,-6), (2,-7) angle?

In the diagram below, ab and bc are tangent to o. what is the measure of

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.

Which season occurs in the northern hemisphere when the sun is at its lowest point in the sky