An increase in which gas would cause the most greenhouse warming of earth's atmosphere?

1. nitrogen
2. oxygen
3. carbon dioxide
4. hydrogen

Which of the following diseases may be transmitted through an accidental needle stick? a. syphilis b. tuberculosis c. cellulitis d. hepatitis b

What two fields of study provide the core information that is used to classify organisms?

Which of these is true for bacteria because they are prokaryotic cells? a. they can engulf body cells in order to make memory cells. b. they must invade viruses in order to reproduce. c. they are much larger than eukaryotic body cells. d. they can reproduce on their own outside of other cells.