When europeans arrived, the white and red pine that grew near the jack pine plains, were logged and then all the pine acreage was set on fire. millions of acres of pine trees were burned. how did these practices temporarily impact the carbon cycle model seen here?

Scientists are conducting a study on the effectiveness of a new drug on memory loss. they are giving some of the test subjects the new drug to find out if it improves their long-term memory. which are possible limitations of this study? check all that apply. a) test subjects may want to participate in additional experiments. b) test subjects may think they should be paid more. c) test subjects may get bored and want to quit early. d) test subjects may have to travel during the experiment. e) test subjects may have full-time jobs. this is multiple choice. you for the !