What contributed the most to human migration more than ten thousand years ago? sturdy boats were invented. another ice age occurred. a major volcano erupted in africa. a severe drought occurred.

The correct answer is - Another Ice Age occurred.

More than ten thousand years ago, the Earth was in an Ice Age faze. During this age, because of the lower level of the seas and because of the large ice masses, lots of land-bridges emerged. This land-bridges were used by the humans to migrate to new territories, and slowly but surely they did managed to colonize most of the world in this period of time.

where is the picture of the graph or table?

the right answer for the question that is being asked and shown above is that: "their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.  " the  participant in european imperialism is being described below is that  their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.