Due to global warming, the ice is melting and polar bears are having to swim longer distances to survive and find more ice to rest on. Knowing that there is natural variation in the amount of webbing in polar bear feet, some more and some less, make a hypothesis about what might happen to polar bear feet over time. As you explain use the words natural selection, favorable trait, and most fit.

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 !