Trace elements are those required by an organism in only minute quantities. which of the following is a trace element that is required by humans and other vertebrates? (a) nitrogen (b) iodine (c) calcium (d) sodium (e) phosphorus.

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