Imagine that you are an ecologist who must determine whether an entire river and lake biome is being threatened by human activity. what might you look for in an indicator species? a. one that has been introduced to the biome. b. one that lives off of the biome's water-loving trees. c. one that is most easily affected by changes in water quality. d. one that you are most familiar with, and for which you can judge health by appearance of fur or other outward indicators

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 !