For the carbon cycle and the nitrogen cycle to function properly, which organisms must always be present?

Witch type of microscope is used to view very small cell components like proteins and dna?

Environmental impacts on evolution : mastery test

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