Which of the following causes the jet stream?

high altitude clouds
low altitude clouds
differences in size between two air masses
differences in temperature between two air masses

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.