What do objects in space that are moving at a constant velocity in a straight line do? A require constant energy to keep moving
B keep moving at a constant velocity until some force acts on them
C always move in an orbit
D stop on their own when they run out of energy

Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. the winds blow from west to east in jet streams but the flow often shifts to the north and south. jet streams follow the boundaries between hot and cold air. the earth's rotation is responsible for the jet stream as well.

Idont understand the question