During a thunderstorm, an observer can see lightning before hearing its thunder. Why do we see lightning before we hear thunder? O Sound travels slower than light
O Sound needs a medium to travel through.
O Sound cannot reflect off surfaces as easily as light.
O Sound is not processed by the brain as fast as light.

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 !