What power sources did humans use before and during McCoy's era?
People used animal power, mules, oxen, and horses.
People used wind power, used to pump water from wells.
People used water powered mills used to grind grains and cut lumber.
all of the above
Wind, water, tide and muscle - both animal and human - provided sources of energy that are still available to man and are still used to power simple machines in many parts of the world today
