Early scientists believed that the Sun and planets all orbited Earth. Eventually scientists were able to use telescopes and
other technology to disprove this theory. Which model best describes our current understanding of our solar system?
A
Geocentric
B. heliocentric
C. supercentric
D. terracentric

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 ethnic conflicts in darfur have led to an attempt to destroy a whole people known as

Can you give an explanation of what medc and ledc are.