What role did Marco Polo serve in the Mongol Empire? Marco Polo provided military tactics to Genghis Khan.
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Marco Polo worked as an adminisator for 17 years.
Marco Polo ran one of the khanates in the region.
Marco Polo wrote a book about Kublai Khan,

How does photosynthesis show the conservation of mass and energy?

True or false multiple lane changes must be done individually going through the same procedures for each lane change

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 !