What kind of air masses form over land?
a) maritime air mass
b)polar air mass
c)continetal air mass
d)tropical air mass

Continental Air Mass.

Explanation: The mass of air that is formed over land is continental air mass. The air that is hotter and colder air masses that moves over land.

Continental air masses are dry and other air masses such as monsoon and maritime are moist. These air masses are hotter in the tropical regions and colder in the regions of North america.

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

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