Which best explains how scientists confirmed that the moon formed around the same time as earth? a. scientists determined the approximate age of fossils from the moon and earth. b. scientists used radioactive dating to study the age of material from the moon and earth. c. scientists explored the cycle of condensation and evaporation over time on the moon and earth. d. scientists analyzed the content of gases that were part of the atmospheres on the moon and earth.

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 !