Which is evidence that supports the dynamo theory

The earth's core is dominantly composed of nickel and iron. Outer core is liquid and inner core is solid.

            The liquid present in the outer core moves continuously over the much denser solid inner core, acting as electrically conductive medium. Due to this a magnetic field is produced, which develops a magnetosphere that obstructs the incoming solar radiations from the sun.

Thus the outer liquid core helps us in understanding the dynamo theory.

i thinking chemical change

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.