For what reasons traveling on foot was slow?

Which of the following statements about this graph is accurate? world grain production has increased in every year since 1950. the amount of grain grown between 1950 and 1980 decreased. world grain production has generally increased between 1950 and 2010. more grain was grown in 1950 than in any other year.

Leading up to the french and indian war, the british were

Based on this map, approximately how far did the songhai empire stretch east tward into the interior from the coast