Diffusion is considered a form of passive transport. What does "passive" mean?

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?

Under the soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources. select the best answer from the choices provided a b c d