Mr. Tolman believes that our universe is expanding, but with all of the gravitational force from the celestial bodies of space, the universe will begin to contract. He believes in the .

Which of the following types of nonrenewable fuel sources requires the storage of radioactive waste? a. coal b. nuclear c. solar d. oil

How many structures do prokaryotic cells have in common with the eukaryotic cells? a. 2b. 3c. 4d. 5

Modern austria followed switzerland's economic model by a. exploiting its natural resources b. developing skilled-labor industries c. engaging in strip mining d. relying on a tourism industry