The greatest ring system around a planet in our solar system surrounds which of the following planets?
a. mars
b. neptune
c. saturn
d. mercury

Where is the vascular system located

Agricultural practices in the united states nearly led to the extinction of the peregrine falcon during the 1950s and 60s.

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.