Why do we have a leap year every four years and true or false earth orbit around the sun is what causes night and day and what causes the link of shadows to change over the course of the day and true or false all constellations are visible from the earth each night and listens to observations that will lead you to believe that the earth rotates on exist and what kind of instrument developed by Leon Foucault, provides physical evidence that earth is rotating on its axis and fill in the blank using the word the same as a different van and other planets such as Mars and Jupiter have year lengths that are the length of a year on earth and if it is 9 AM in San Francisco, is it also 9 AM in New York? Why or why not?also A sundial uses patterns of what to tell time?A.) sunny days B.)shadows C.)clouds D.) stars

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.