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what is the cause of plants growing in the sahara desert again after hundreds of years?

What are the similarities and differences between byzantine empire and kiev russia

What is the difference between an independent and a dependent variable?

    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