Which answer best indicates the dynamic balance of an ecosystem?

space and food vs. temperature and water
number of plants vs. number of animals
number and variety of organisms vs. changing environment
number of organisms vs. constant environment

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