The North Slope of Alaska has concentrations of air pollutants comparable to the air pollutant concentration of some major cities on the east coast of the United States because А .the snowmobiles used by the people of the region pollute significantly more than cars and trucks
B .the region is currently undergoing an industrial boom
C .pollutants are transported by air from Eurasia
D .volcanoes in the region naturally release large amounts of particulates
E .the cold weather prevents the dissipation of pollutants

Explanation:

i think it is the answer is A and i hope it helps tnx

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation:

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.