According to the centers for disease control and prevention (cdc), is the single most important procedure for preventing the spread of infection. question 4 options: sterilizing equipment education immunization hand washing

Select the correct answer. what was edwin hubble's contribution to the field of astronomy? a. he discovered variable stars. b. he proved that the heliocentric model accurately described our solar system. c. he found a relationship between the period luminosity and distance of stars. d. he proved that the universe is finite. e. he discovered that the universe was expanding.