Which water source is least useful to humans for drinking purposes?
A
groundwater
B. freshwater lakes
C.
rivers
D
oceans

This would be an open primary. a closed primary people can vote only prior to election day if the party if they are registered. independent voters can not participate. there is not a wide-open primary, but there is a semi-open primary.

Joe ran 130 yards because 3 feet make 1 yard so using this ratio 390 feet make 130 yards.

Physical systems is the answer