Because they were fighting on their own territory and defending their home, the vietcong had greater determination than the US who were not really sure what they were there for.
The third one. Bias means to choose one side over another w/o a reason or with a reason
Very early societies did not have a written language or even ways to efficienly preserve information, so we can reject the options "maps" and "written records".
As far as the other two options go - ice core samples and tree rings, both are correct! probably "ice core" samples are the better answer, since only fossilized tree rings would tell us about the very early societies.
Answer:
Trade networks resulted in the widespread exchange of ideas and resources.
Explanation:
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