An important effect that hunter-gatherer societies may have had on the environment was. A. soil erosion
B. extinction
C. air pollution
D. All of the above

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

Using meiosis, the sporophyte produces spores that are .

2polnis which of the following is an advantage of an in vitro experiment?me