'Horse Drawn Vehicles' were once the primary transportation method, and there were 3 involved animals, horses, mules, and oxen, although horses were the original go to for a carriage, due to fast movement, oxen soon became popular amoungst emigrants.
I think it's c because depression can be genetic and environmental.
hope this helps.
Assuming we don't know the speed capabilities of the tractor, the time it would take simply be the rate in miles per hour. It has a direct correlation between speed and time spent, so the miles the tractor needs to plow is unneeded.
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The executive committee is often officially responsible for making a company's big decisions while another, unofficial group, led by the CEO, seems to hold the real decision-making power.
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