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,

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

All other things being equal the size of a population will decrease if

Which statement correctly compares metaphase i and metaphase ii? in metaphase ii twice as many chromosomes line up along the middle of the cell as in metaphase i. in metaphase i twice as many chromosomes line up along the middle of the cell as in metaphase ii. in metaphase ii twice as many chromosomes are pulled to opposite ends of the cell as in metaphase i. in metaphase i twice as many chromosomes are pulled to opposite ends of the cell as in metaphase ii.