20. Which of the following was NOT a factor that left the western part of the Roman Empire more vulnerable to collapse than the eastern half at the
end of the fourth century C. E.?*

    which of the following was anecological  result of european exploration from 1400 to 1800?   a.  increased trade with east asia      b.  the spread of epidemic diseases      c.  expansion of english territory      d.  the spread of christianity