When choosing livestock, it was important for travelers to consider a.
if the animals had made the journey before, how fast the animals could travel, and whether the animals knew the way.
b.
if the animals could swim up the rivers and whether the travel would include muddy or sandy roads.
c.
if travel included sandy or muddy roads, how much the animals would cost, and how fast the animals could travel.
d.
if animals could survive the desert heat and how much the animals would cost.