Why is there no mining activity on antarctica?
a. the potential profit is outweighed by the harsh conditions there.
b. the continent’s coal and oil reserves were exploited and now have been exhausted.
c. mining there is prohibited by international agreement.
d. there is no evidence that the continent holds mineral resources.

Before they can be published, scientific papers must be peer-reviewed. this means that: a) some other scientific experts read the papers and guarantee that they are true. b) some other scientific experts read the papers and provide quality control by eliminating many mistakes. c) an editor reads the papers, to make sure that all the semicolons are in the correct places. d) everyone in the world is given the opportunity to comment on the papers through a specially maintainedblog. e) government bureaucrats read the papers, to be sure that the papers do not insult the political positions ofthe current officeholders.