The ozone layer

shields us from meteorites
is where weather occurs
is the closest air layer to earth
protects us from the ultraviolet rays of the sun

both the house and senate must approve the conference report.   after it is approved by both on an identical from, it will be sent to the president.   if the president approves it, it will become law.

answer; /// i believe the correct answer is (when one group has an extremely high score at pretest;