What signifies the period known as prehistory?
a. language was fully evolved.
b. writing was very elementary.
c. there was no form of writing.
d. records were hidden away.

mount st. helens in washington erupts, causing a massive avalanche and killing 57 people on this day in 1980. ash from the volcanic eruption fell as far away as minnesota. seismic activity at mount st. helens, which is 96 miles south of seattle, began on march 16.

the exclusive possession or control of the supply or trade in a commodity or service.