Which of the following is not allowed on your vehicle during a vehicle inspection?
a. flashing red lights
b. a muffler cut-out
c. an exhaust whistle
d. all of the above

Which of the following discoveries would be most likely to cause a scientific paradigm shift? a. the discovery of more rings around uranus b. the discovery of a new pathogenic virus transmitted by mosquitoes c. the discovery that a dormant volcano is showing signs of activity d. the discovery of a new species of salamander in the amazon rainforest e. the discovery that excess heat is radiating from the center of the earth and causing global climate change