Ineed this before tomorrow, ! how does the polar jet stream affect temperature and precipitation in north america? you if you answer!  

Hello! The polar jet stream contains strong winds that moves weather around different parts of the globe. It affects the weather and temperature, because they push air masses around, and separates warm and cold air. Cold fronts formed from cold air represents represents low pressure systems, which consists of rain or other precipitation, while warm fronts represent high pressure systems and sunny weather. They play an effect on air transportation, because planes travel faster along the jet stream, but they also have to do with global warming.

Answer:

it provides an alternative energy pathway for the reaction to proceed.

explanation:

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.

The 3 steps are vasoconstriction, temporary blockage of a platelet plug, formation of a fibrin clot better known as coagulation.