Which two types of air masses would contribute to a polar jet stream? those with different temperatures meeting near the equator those with different temperatures meeting near the north and south poles those with same temperature meeting near the equator those with same temperature meeting near the north and south poles

The answer is B (different temperatures meeting near the north and south poles.

A jet stream can be defined as air current in fast motion at around 7-12km (4.3-7.4miles) above sea level. There are different types of Jet Streams; the Polar Jet Stream form on the north and south poles at about a latitude of 50 to 60 degrees. 

2hydrogen and 1 covalent